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All Journal Scientific Journal of Informatics Jurnal Ilmiah Peuradeun SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan DedikasiMU: Journal of Community Service Nuras : Jurnal Pengabdian Kepada Masyarakat Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Jurnal Abdimas Journal of Community Empowerment
Rohman, Shohihatur
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Customer Segmentation Using the Integration of the Recency Frequency Monetary Model and the K-Means Cluster Algorithm Alamsyah, Alamsyah; Prasetyo, P. Eko; Sunyoto, Sunyoto; Bintari, Siti Harnina; Saputro, Danang Dwi; Rohman, Shohihatur; Pratama, Rizka Nur
Scientific Journal of Informatics Vol 9, No 2 (2022): November 2022
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sji.v9i2.39437

Abstract

Purpose: This research aims to do customer segmentation in retail companies by implementing the Recency Frequency Monetary (RFM) K-Means cluster model and algorithm optimized by the Elbow method.Methods: This study uses several methods. The RFM model method was chosen to segment customers because it is one of the optimal methods for segmenting customers. The K-Means cluster algorithm method was chosen because it is easy to interpret, implement, fast in convergence, and adapt, but lacks sensitivity to the initial partitioning of the number of clusters. To help classify each category of customers and know the level of loyalty, they use a combination of the RFM model and the K-Means method. The Elbow method is used to improve the performance of the K-Means algorithm by correcting the weakness of the K-Means algorithm, which helps to choose the optimal k value to be used when clustering.Result: This research produces customer segmentation 3 clusters with a Sum of Square Error (SSE) value of 25,829.39 and a Callinski-Harabaz Index (CHI) value of 36,625.89. The SSE and CHI values are the largest ones, so they are the optimal cluster values.Novelty: The application of the integrated RFM model and the K-Means cluster algorithm optimized by the Elbow method can be used as a method for customer segmentation.
OPTIMALISASI STRATEGI UPSCALING UMKM SENTRA OLAHAN KEDELAI DI BANDUNGAN, KABUPATEN SEMARANG Sunyoto, Sunyoto; Rohman, Shohihatur; Rachmadi, Moch Faizal; Anisykurlillah, Indah
DedikasiMU : Journal of Community Service Vol 6 No 4 (2024): Desember
Publisher : Universitas Muhammadiyah Gresik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30587/dedikasimu.v6i4.8788

Abstract

Usaha Mikro, Kecil dan Menengah (UMKM) mempunyai kontribusi yang sangat signifikan dalam perekonomian nasional. UMKM dengan ketangguhan yang ada mampu menjadi buffer dan bersifat resilien (kuat dan tangguh). Pengembangan UMKM dapat mengoptimalkan berbagai sumber daya yang melimpah di Indonesia mulai dari sektor pangan, kerajinan, logam, kearifan lokal dan sebagainya. Oleh karena itu, diperlukan sinergitas dan kolaborasi berbagai pihak dalam pengembangan UMKM agar dapat upscaling pada berbagai sektor di tingkat pasar global. Kegiatan pengabdian kepada masyarakat ini dilaksanakan dengan tujuan menyelesaikan permasalahan yang dihadapi oleh industri kecil pembuatan tahu khas Bandungan, Kabupaten Semarang, Jawa Tengah. Adapun mitra kegiatan pengabdian adalah UMKM Tahu Khas Bandungan atau Tahu Serasi “Lestari” dengan alamat Desa Kenteng RT 07/RW 01, Kecamatan Bandungan, Kabupaten Semarang, Jawa Tengah. Terdapat dua aspek permasalahan yang akan ditangani, yaitu aspek produksi dan aspek manajemen. Dalam pelaksanaan dipakai beberapa metode yang saling mendukung, antara lain dengan penyuluhan, demonstrasi, praktik langsung dan pendampingan. Dalam pembuatan mesin/alat yang akan diterapkan di mitra akan dilaksanakan di workshop jurusan Teknik Mesin FT Unnes, dengan melibatkan teknisi dan mahasiswa. Hasil kegiatan pengabdian ini adalah dihasilkannya Teknologi Tepat Guna (TTG) berupa 1 unit alat press tahu mekanis, pendampingan pembukuan dan manajemen usaha, peningkatan promosi, produksi, pemasaran dan produktivitas usaha berbasis optimalisasi kompetensi Sumber Daya Manusia (SDM).
Penerapan teknologi pengolahan ikan berbasis energi listrik pada POKLAKSAR Putri Tirang Semarang Widodo, Rahmat Doni; Paramita, Octavianti; Syafei, M. Hilman Gumelar; Rohman, Shohihatur; Sunyoto, Sunyoto
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 3 (2025): May
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i3.30286

Abstract

AbstrakBandeng duri lunak atau bandeng presto merupakan salah satu produk unggulan Kota Semarang. Para pengusaha kecil (tradisional) sebagai produsen bandeng duri lunak selama ini masih menemui beberapa permasalahan menyangkut aspek produksi, kualitas, dan manajemen usaha serta pemasaran. Tujuan kegiatan ini adalah untuk memecahkan permasalahan yang dihadapi mitra, yaitu kelompok pengolah dan pemasar (Poklaksar) “Putri Tirang”, yang bergerak dalam usaha pengolahan dan pemasaran hasil perikanan, khusunya bandeng. Poklaksar “Putri Tirang” beranggotakan 10 orang, dengan ketua Ibu Mukhayanah, beralamat di Jl. Tapak RT 06 RW 04 Kelurahan Tugurejo, Kec. Tugu, Kota Semarang. Bidang usaha utama adalah pengolahan ikan, khusunya bandeng untuk dibuat bandeng duri lunak atau bandeng presto. Permasalahan utama mtra adalah pada aspek produksi, yaitu dalam memasak bandeng masih menggunakan panci presto konvensional sehingga berdampak pada produktivitas, kualitas, dan pemasaran bandeng presto. Sebagai solusinya, dalam kegiatan pengabdian kepada masyarakat ini akan diterapkan teknologi pengolahan ikan berupa panci presto dengan pemanas listrik, yang terbukti lebih hemat daripada panci presto dengan bahan bakar LPG. Selain aspek produksi, dalam kegiatan ini juga akan ditangani permasalahan terkait aspek kualitas dan pemasaran produk. harus jelas, ringkas, dan deskriptif. Kata kunci: bandeng presto; produksi; panci presto; pemasaran AbstractSoft-boned milkfish, also known as "bandeng presto," is a flagship product of Semarang City. Small-scale (traditional) entrepreneurs producing soft-boned milkfish continue to face challenges related to production, quality, business management, and marketing. This activity aims to address the issues faced by the partner group, the "Putri Tirang" Fish Processing and Marketing Group (Poklaksar), which specializes in processing and marketing fishery products, particularly milkfish. The "Putri Tirang" group consists of 10 members, led by Mrs. Mukhayanah, and is located at Jl. Tapak RT 06 RW 04, Tugurejo Village, Tugu Sub-district, Semarang City. Their main business is fish processing, focusing on producing soft-boned milkfish or bandeng presto. The primary problem faced by the group lies in production, as they still use conventional pressure cookers, which affect the productivity, quality, and marketing of their products. As a solution, this community service activity introduces fish processing technology using electric pressure cookers, which are proven to be more cost-efficient than LPG-powered pressure cookers. In addition to addressing production issues, this activity also tackles problems related to product quality and marketing.  Keywords: soft-boned milkfish; production; pressure cooker; marketing
Unraveling the Merdeka Curriculum: Exploring Differentiated Instruction’s Impact on Student Learning Samsudi, Samsudi; Supraptono, Eko; Utanto, Yuli; Rohman, Shohihatur; Djafar, Tasliati
Jurnal Ilmiah Peuradeun Vol. 12 No. 2 (2024): Jurnal Ilmiah Peuradeun
Publisher : SCAD Independent

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26811/peuradeun.v12i2.1131

Abstract

Differentiated instruction, as the application of the ‘teaching at the right level’ principle, which involves tailoring teaching to student’s needs and the diversity of their interests and readiness, needs to be developed in Merdeka Curriculum implementation. This research aimed to measure the influence of learning components, including variables such as planning, implementation, and learning assessment, as well as learning elements, including variables such as content, processes, learning outcomes, and the learning environment, on the potential for differentiated instruction in elementary and secondary education. This research employed a quantitative method, using path analysis to measure the significance of the influence of independent variables (learning components and learning elements) on the potential for differentiated instruction. The results indicated that three variables significantly influence the Potential for Differentiated Instruction (Y), namely: Learning Components/ Learning Assessment (X3) with a t-value of 12.817 > ttable1,985; Learning Elements/ Learning Processes (X5) with a t-value of 10.223 > t ttable 1,985; and Learning Outcomes/ Achievements (X6) t-value 9.817 > ttable 1,985. Thus, the potential for differentiated instruction in Merdeka Curriculum implementation in elementary and secondary education can be maximized if teachers can plan and implement learning assessments accurately, manage differentiated instruction processes, and apply differentiated instruction outcomes.
Pengembangan Media Pembelajaran Berbasis PowerPoint untuk Meningkatkan Hasil Belajar Gambar Teknik Proyeksi Amerika Handriaswara, Handriko; Rohman, Shohihatur; Musyono, Ari Dwi Nur Indriawan; Apristia, Lelu Dina; Kriswanto, Kriswanto
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 5 No. 3 (2025): July
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v5i3.610

Abstract

This study aims to develop interactive PowerPoint-based learning media for Engineering Drawing, specifically the topic of American Projections, and to determine the feasibility and effectiveness of this media in improving student learning outcomes. The research method used is Research and Development (R&D) with the ADDIE (Analysis, Design, Development, Implementation, and Evaluation) development model. The developed learning media was validated by material experts and media experts, with an assessment of 84% from the material experts (very feasible category) and 75% from the media experts (feasible category). The trial was conducted in class X of Mechanical Drawing at a Vocational High School (SMK), which showed an increase in the average score of student learning outcomes, from 51.67 (pre-test) to 86.67 (post-test). The results of the effectiveness analysis using the N-Gain formula showed a score of 0.71 or 71.46%, which is included in the moderately effective category. Based on these results, it can be concluded that the developed interactive PowerPoint-based learning media is feasible and effective for use in Engineering Drawing learning, specifically for the topic of American Projections. This media also has the potential to increase student engagement and learning outcomes interactively at vocational high schools.
Aloe Vera Cultivation and Post-Harvest Processing for Daily Life Sutopo, Yeri; Rudyatmi, Ely; Rohman, Shohihatur; Setiyanto, Denny Firman; Dewa, Pramaditya Putra Komala; Andhika, Pedro
Journal of Community Empowerment Vol. 4 No. 2 (2024): Journal of Community Empowerment
Publisher : Universitas Negeri Semarang

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

Abstract

Aloe vera was often wasted, even though it actually has many benefits. During a morning walk in the Taman Kradenan Asri housing complex, many aloe vera plants were found to be thrown away. When asked to the owner of the plant, why were so many of his aloe vera plants thrown away? The owner of the aloe vera replied that this plant grows very quickly, even though its use was only a little, namely for washing hair as a shampoo supplement and its mucus to help heal minor wounds. This fact encouraged community service activities to be carried out in the housing complex, namely through training for mothers of the Dasa Wisma. This community service activity aims to describe skills and knowledge in developing higher quality aloe vera which could later be used to produce processed products for mothers who are members of the Dasa Wisma in RW 11, Sukorejo Village in Semarang City. The results of this community service show that: (1) The knowledge of the local women who participated in the training and mentoring regarding Aloe Vera cultivation and post-harvest processing for daily life in RW 11, Sukorejo Village, Gunungpati District, Semarang City, most of the 50% of participants had knowledge in the category Enough.; (2) Skills of local women who participated in training and mentoring on Aloe Vera Cultivation and Post-Harvest Processing for Daily Life in RW 11, Sukorejo Village, Gunungpati District, Semarang City, the majority of whom, namely 55.5% of participants, had skills in the sufficient category.
Development Of An Electric Motorcycle Trainer Kit As A Learning Medium For Electrical Engineering And Automotive Engineering Majors In Vocational High Schools Supraptono, Eko; Wibowo, Apriansyah; Wijaya, M. Burhan Rubai; Rohman, Shohihatur; Siraj, Ubaidillah; Qunefi, Fuat; Mubarak, Raihan Fa’iq; Baskoro, Aldo Luhung; Aryaditama, Geofan; Fathimah, Aisya Fathimah
Jurnal Abdimas Vol. 29 No. 1 (2025): June 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/pvn4eh96

Abstract

The increasing demand for electric vehicles (EVs) due to global warming and environmental issues necessitates specialized knowledge in this field. This research develops an electric motorcycle trainer kit designed to enhance learning in vocational high schools, specifically in the Electrical Engineering and Automotive departments. The research aimed to design and validate a trainer kit that accurately represents an electric motorcycle's electrical system, facilitating hands-on learning for students. The methodology involved data collection, product design, and implementation with validation by field experts. Results showed that the trainer kit significantly improved students' understanding and practical skills related to electric vehicle systems. In conclusion, the electric motorcycle trainer kit proved to be an effective educational tool, supporting the development of competencies required for the growing electric vehicle industry. Further improvements in the aesthetic and technical aspects of the kit could enhance its future applications.
Penerapan Teknologi Forged Carbon Compression Split Moulding (FCCSM) untuk Mendukung Industri Hijau dan Zero Waste pada UKM Komponen Berbahan Karbon Fiber Roziqin, Ahmad; Hapsoro, Bayu Bagas; Rohman, Shohihatur
Nuras : Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 4 (2025): October
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/nuras.v5i4.730

Abstract

The use of carbon fiber (carbon fiber reinforced plastic) in the automotive component industry produces significant waste, reaching 15-20% of the total raw materials. The community service partner, BPM Carbon Works Semarang, previously handled this waste by incineration, which caused environmental and economic problems. This community service program aims to address these problems through the application of Forged Carbon Compression Split Molding (FCCSM) technology. The methods used include lectures, demonstrations, hands-on practice, and assistance in designing two- and four-part split molds, as well as processing carbon fiber waste into commercially valuable products. The results of the activity show that the amount of partner waste is reduced from 20% to 5%, and partner understanding increases significantly with N-Gain scores of 0.73 and 0.75 (high category). In addition, partner profits increase by 15%. This program not only solves environmental problems, but also empowers the partner's economy, in line with the achievement of sustainable development goals (SDGs). Thus, it can be concluded that FCCSM technology is effective in achieving a zero-waste industry, and ongoing mentoring and collaboration with local governments are recommended.
Analisis Pengujian Kebisingan dan Emisi Gas Buang pada Sepeda Motor Honda 110 cc Menggunakan Knalpot AHLM (Adaptive High-Performance, Low-Pollution Muffler) Putra, Ni’mal Maula; Roziqin, Ahmad; Naryanto, Rizqi Fitri; Septiyanto, Angga; Maulana, Sonika; Rohman, Shohihatur
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 5 No. 4 (2025): October
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v5i4.708

Abstract

The high levels of air pollution and noise from motor vehicles cause negative impacts on the environment and health. Innovation in exhaust systems is needed to address this issue. This study aims to analyze the effect of different exhaust types on noise levels and exhaust gas emissions in a Honda 110 cc motorcycle. The independent variable in this study is the type of exhaust (standard, free flow, and AHLM), while the dependent variables include noise level (dB) and emissions of carbon monoxide (CO) and hydrocarbons (HC). The control variables include measurement distance, engine operating temperature (80°C to 90°C), and fuel type (RON 90). The research method uses a quantitative experimental approach with a sound level meter to measure noise and a gas analyzer for exhaust emissions. Data analysis was performed using the Kruskal-Wallis test to determine differences among exhaust variations. The statistical test results showed no significant difference (p > 0.05) in noise levels and exhaust emissions among the three types of exhaust. However, descriptively, the AHLM muffler performed best, reducing noise by up to 5.88% compared to free flow, and decreasing CO emissions by 17% and HC by 1%. This study is limited to testing one type of motorcycle and laboratory conditions, so the results do not yet represent actual traffic conditions. Thus, the AHLM muffler has the potential to be an adaptive exhaust system innovation that is more environmentally friendly and effective in reducing noise and motor vehicle emissions.
Analisis Pengujian Konsumsi Bahan Bakar dan Performa pada Sepeda Motor Honda 110 cc Menggunakan Knalpot AHLM (Adaptive High-Performance, Low-Pollution Muffler) Fayisa, Fadhil; Roziqin, Ahmad; Naryanto, Rizqi Fitri; Septiyanto, Angga; Maulana, Sonika; Rohman, Shohihatur
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 5 No. 4 (2025): October
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v5i4.709

Abstract

Motor vehicle emissions and energy efficiency are key concerns in developing environmentally friendly automotive technologies, particularly for small-capacity motorcycles, which remain the dominant mode of transportation in Indonesia. This study aims to analyze the effect of using the AHLM (Adaptive High-Performance, Low-Pollution Muffler) on fuel consumption and engine performance in a Honda 110 cc motorcycle. The research employed a comparative experimental method using three types of exhaust systems: standard, free flow, and AHLM. Tests were conducted using an engine dynamometer to measure torque and power, and a fuel consumption tester to record the time required to consume 10 ml (0.0074 kg) of fuel, calculated using the conversion formula m = (V_ml / 1000) × ρ, at three engine speeds: 1500 rpm, 2500 rpm, and 3500 rpm. The results show that the free flow exhaust produced the highest torque and power, at 10.9 Nm and 11.7 HP at 9000 rpm, respectively, but with higher fuel consumption. Conversely, the AHLM exhaust demonstrated better fuel efficiency, with consumption rates of 0.083 kg/h at 1500 rpm, 0.317 kg/h at 2500 rpm, and 0.416 kg/h at 3500 rpm, closely matching the efficiency of the standard exhaust. Although its peak power was slightly lower, the AHLM maintained stable torque and efficient combustion across all engine speeds. In conclusion, the AHLM exhaust system provides an optimal balance between performance and energy efficiency, offering potential as an adaptive exhaust technology that is both effective and environmentally friendly for small-capacity motorcycles.
Co-Authors Ahmad Roziqin, Ahmad Alamsyah - Andhika, Pedro Apristia, Lelu Dina Aryaditama, Geofan Baskoro, Aldo Luhung Bayu Bagas Hapsoro, Bayu Bagas Dewa, Pramaditya Putra Komala Djafar, Tasliati Eko Supraptono Ely Rudyatmi, Ely Fathimah, Aisya Fathimah Fayisa, Fadhil Handriaswara, Handriko Indah Anisykurlillah Kriswanto Kriswanto, Kriswanto M. Burhan Rubai Wijaya Mubarak, Raihan Fa’iq Musyono, Ari Dwi Nur Indriawan Octavianti Paramita P. Eko Prasetyo Pratama, Rizka Nur Putra, Ni’mal Maula Qunefi, Fuat Rachmadi, Moch Faizal Rizqi Fitri Naryanto Samsudi . Septiyanto, Angga Setiyanto, Denny Firman Siraj, Ubaidillah Siti Harnina Bintari Sonika Maulana Sunyoto Sunyoto Syafei, M. Hilman Gumelar Wibowo, Apriansyah Yeri Sutopo Yuli Utanto