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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics MUQTASID InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan Sinkron : Jurnal dan Penelitian Teknik Informatika JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Inovasi : Jurnal Ekonomi, Keuangan, dan Manajemen Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Indonesian Physical Review JTIK (Jurnal Teknik Informatika Kaputama) Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Unri Conference Series: Community Engagement Journal of Applied Data Sciences Journal of English Language and Education Journal of Advanced Sciences and Mathematics Education International Journal of Trends in Mathematics Education Research (IJTMER)
Tulus Tulus
Departemen Matematika, FMIPA Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry Humanities Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Edukasi Urban Farming Melalui Implementasi Hidroponik dan Budikember Meningkatkan Ketahanan Pangan dan Kesejahteraan Masyarakat di Medan Tuntungan, Sumatera Utara Siregar, Ameilia Zuliyanti; Nasution, Zulkifli; Tulus, Tulus; Panjaitan, Nismah
Unri Conference Series: Community Engagement Vol 6 (2024): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.6.50-58

Abstract

Urban farming is carried out to overcome limited land and increase family food security. Cultivating vegetable crops and raising fish are solutions for urban agriculture. The method for implementing International Community Service (PkMI) was implemented in Medan and Penang, Malaysia in June 2024 at the Griya Nusa Tiga Complex Blok B-29 Medan through: a). Socialization and Focus Group Discussion (FGD) regarding urban farming education in residential environments ; b). Hydroponic and Aquaponic training and practice (budikdamber); c). Entrepreneurship training and practice for partners; d). Mentoring and monitoring. PkMI results show ed an increase in the knowledge and skills of partners (20 residents of the Griya Nusa Tiga Complex) in understanding the definition, benefits and implementation of Urban Farming; the growth of the entrepreneurial spirit of residents for independent and sustainable aquaponic cultivation; and able to meet dual protein needs (vegetables and fish); processing budikdamber products appropriately.
Characterization of The Main Characters in Me Before You By Jojo Moyes: An Analysis of Structure and Plot Dynamics Tulus, Tulus
Journal of English Language and Education Vol 10, No 2 (2025)
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jele.v10i2.752

Abstract

Characterization of the main characters is an essential element in establishing an emotional connection between the reader and the storyline in a novel. Me Before You by Jojo Moyes presents profound characterization through its two main characters, Louisa Clark and Will Traynor, who have contrasting backgrounds and motivations. This study aims to analyze how the characterization of these two characters contributes to the structure and quality of the novel’s plot. The research employs a qualitative approach with text analysis, encompassing character identification, psychological analysis of characters, and exploration of narrative structure. Data were collected through in-depth reading and note-taking of key elements related to character development and their interaction with the plot. The findings reveal that the characterization of Louisa and Will plays a crucial role in shaping the story’s dynamics. Louisa evolves from an insecure individual into a more independent and courageous person, while Will experiences deep internal conflict regarding control over his life. Will's firm adherence to his decision creates intense emotional tension in the plot, reinforcing the central themes of freedom of choice, sacrifice, and the meaning of life. Additionally, validation through literature review and discussions with academics supports the idea that characterization in this novel aligns with concepts in contemporary literature. The study concludes that complex and realistic characterization not only drives the plot but also adds depth to the themes and messages conveyed. Through strong character depiction, Me Before You successfully engages readers emotionally and offers a profound reflection on life choices and their consequences in human existence.
Ambulance integration model in smart city for health services Dewi, Rafiqa; Tulus, Tulus; Zarlis, Muhammad; Budhiarti Nababan, Erna
Bulletin of Electrical Engineering and Informatics Vol 14, No 3: June 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v14i3.7202

Abstract

Smart city is a city built to create efficient, sustainable, fair and livable cities. Increasing the percentage of population survival in standard and emergency times or emergency medical services (EMS) is one of the main pillars of a smart city. This study develops previous research. The weakness of this model is that it needs to consider the dynamic travel time factor. The model only considers the fixed travel time between two locations, which may not represent the actual conditions on the highway. It is less flexible because it only finds one threshold value α for all λi. Researchers succeeded in developing a model to overcome the model weaknesses in (4) by adding new constraints that consider ambulance capacity and overcome the shortcomings of the model (5) by adding tighter limits on the value of α to minimize the difference between the values of λi and αλi. In addition, constraints can also be added to ensure that α is a realistic value and meets business requirements.
Thematic approach and its effectiveness in improving learning outcomes, motivation, and critical thinking in natural and social sciences Tulus, Tulus; Aunurrahman, Aunurrahman; Halida, Halida; Dahlan, Hesti; Wigati, Ndaru; Mulya, Hadi
Journal of Advanced Sciences and Mathematics Education Vol 4, No 2 (2024): Journal of Advanced Sciences and Mathematics Education
Publisher : CV. FOUNDAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/jasme.v4i2.475

Abstract

Background: Thematic learning is an effective strategy to address the demands of 21st-century education by integrating critical thinking, collaboration, and creativity through contextual learning environments.Aim: This study aims to evaluate the effectiveness of the thematic approach in improving students' learning outcomes, motivation, and critical thinking skills in Natural and Social Sciences (IPAS) subjects at SMKN 1 Sukadana.Method: The research employed a quasi-experimental design with a pretest-posttest control group. A total of 70 grade XI students were selected as the sample through purposive sampling, divided into experimental and control groups (35 students each). Data were collected using learning outcome tests, motivation questionnaires, and observation sheets. Descriptive and inferential statistical analyses, including t-tests, were conducted after normality and homogeneity tests.Results: The thematic approach significantly enhanced learning outcomes, motivation, and critical thinking skills. The experimental group achieved a 100 percent success rate, compared to 48.57 percent in the control group. Variance in individual responses highlighted differing adaptations to this method.Conclusion: The thematic approach is effective in improving student engagement, motivation, and interdisciplinary learning outcomes, particularly in vocational education. These findings support its implementation as a cross-disciplinary teaching method and provide insights for educational policy development.
Analisis Persepsi dan Nilai Ekonomi Implementasi Eco Enzyme dan Smart Farming di Pondok Pesantren Eumpe Awee Ramli, Ichwana; Siregar, Ameilia Zuliyanti; Nasution, Indera Sakti; Mahidin, Mahidin; Muhibbuddin, Muhibbuddin; Arahman, Nasrul; sulastri, sulastri; melinda, melinda; Nasution, Zulkifli; Nauly, meutia; Siregar, Netti Herlina; Tulus, Tulus
Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vol 25, No 2 (2025): Suluah Bendang: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sb.06420

Abstract

Pengabdian ini bertujuan untuk menganalisis persepsi, minat, dan potensi ekonomi dari penerapan teknologi Eco Enzyme dan Smart Farming di Pondok Pesantren Eumpe Awee. Metode yang digunakan adalah pendekatan Participatory Rural Appraisal (PRA) dengan melibatkan 26 santri sebagai responden utama dan pelaku praktik pertanian. Hasil menunjukkan bahwa sebagian besar santri memiliki tingkat pengetahuan dan minat yang tinggi terhadap teknologi ini, didukung oleh tersedianya sarana seperti sensor kelembapan tanah, sistem irigasi otomatis, dan perlengkapan tanam lainnya yang diperoleh melalui program PMKI Universitas Syiah Kuala. Budidaya kangkung dan bayam yang dilakukan menghasilkan total penerimaan Rp 330.000 dengan biaya produksi Rp 237.000, menghasilkan R/C ratio sebesar 1,39 yang menunjukkan kelayakan finansial. Selain itu, teknologi Eco Enzyme yang dibuat dari limbah organik dan sistem irigasi otomatis berkontribusi terhadap efisiensi sumber daya dan pengurangan penggunaan bahan kimia, memperkuat aspek keberlanjutan lingkungan. Temuan ini mengindikasikan bahwa dengan pendekatan adaptif, pesantren dapat menjadi pusat edukasi sekaligus praktik pertanian berkelanjutan yang memberdayakan santri secara nyata dan aplikatif
A Data-Driven MINLP Approach for Enhancing Sustainability in Blockchain-Enabled e-Supply Chains Badawi, Afif; Efendi, Syahril; Tulus, Tulus; Mawengkang, Herman
Journal of Applied Data Sciences Vol 6, No 4: December 2025
Publisher : Bright Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/jads.v6i4.889

Abstract

Modern e-supply chains are characterized by increasing complexity and a critical need for enhanced sustainability, transparency, and traceability. Blockchain technology emerges as a significant enabler, offering decentralized, immutable ledgers and smart contracts that can support more secure, verifiable, and environmentally responsible operations through trustworthy data. Despite blockchain's potential, a notable gap exists in the availability of quantitative, data-driven optimization models that rigorously assess the operational and sustainability impacts of its integration into e-supply chains, particularly for complex, non-linear system interactions. This study aims to address this gap by presenting an in-depth analysis of a specific Mixed-Integer Non-Linear Programming (MINLP) optimization model. The goal is to clarify its structure, evaluate its application for an e-supply chain incorporating blockchain features (like transaction costs and conceptual smart contract enforcement for compliance) and sustainability objectives (such as carbon emission reduction), and derive practical insights. The methodology involves a detailed exposition of the MINLP model, followed by its application to a defined e-supply chain scenario. The analytical approach includes computational experiments focusing on a base case analysis to demonstrate model functionality. The broader evaluative framework for this study encompasses benchmarking the model’s performance against a conventional system and conducting sensitivity analyses on key parameters to understand performance trade-offs. The initial base case analysis demonstrates the model's capability to optimize supplier selection and operational plans while adhering to sustainability constraints, such as maintaining carbon emissions at or below 300 kg CO₂ per period, and accounting for blockchain-specific costs like a per-supplier usage fee of 500. The structure of the model and preliminary insights suggest its potential to achieve improved environmental impact compared to conventional systems, balanced against associated blockchain implementation costs. This research provides a detailed examination of a complex MINLP structure, offering a data-driven analytical approach for assessing blockchain's role in sustainable e-supply chains. It furnishes a foundational framework and insights that can guide managerial decisions and strategic planning for industries transitioning towards greener, more transparent, and digitally advanced supply chain operations.
A Data-Driven Mixed Integer Nonlinear Programming Model for Cost-Optimal Scheduling of Perishable Production and Workforce Putri, Mimmy Sari Syah; Mawengkang, Herman; Suwilo, Saib; Tulus, Tulus
Journal of Applied Data Sciences Vol 6, No 4: December 2025
Publisher : Bright Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47738/jads.v6i4.1019

Abstract

This study presents a data-driven, Mixed Integer Nonlinear Programming (MINLP) framework for optimizing the multi-period production scheduling of perishable products with integrated workforce planning. Its primary novelty is the holistic integration of a continuous exponential decay function for product deterioration with dynamic workforce planning, creating a unified model that optimizes production, inventory, and labor simultaneously. This approach addresses key challenges in perishable inventory systems by treating labor as a controllable resource rather than a fixed constraint. Mathematically, the model includes nonlinear inventory balance equations with decay terms and resource-dependent capacity constraints. The objective is to minimize total operational cost, comprising production, holding, and spoilage costs. Computational experiments, based on a realistic case study, demonstrate that the proposed model reduces total system cost by 6.2% and spoilage costs by 43.2% compared to a standard heuristic benchmark. The resulting production and labor schedules align closely with demand fluctuations, supporting both economic and operational efficiency. This unified framework advances the mathematical modeling of sustainable production planning and offers a practical tool for real-world industries such as food processing and pharmaceuticals.
Pelatihan dam implementasi eko enzim mendukung pertanian ramah lingkungan memitigasi ketahanan pangan di Pesantren Al Kautsar, Medan Siregar, Ameilia Zuliyanti; Nasution, Zulkifli; Nauly, Meutia; Tulus, Tulus; Siregar, Netti Herlina; Ramli, Ichwana; Mahidin, Mahidin; Nasrul, Nasrul; Nasution, Indera Sakti; Melinda, Melinda; Muhibuddin, Muhibuddin
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 5 (2025): September
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i5.34006

Abstract

Abstrak Kegiatan Pengabdian masyarakat Kolaborasi Indonesia (PMKI) USU 2025 sebagai co-host dengan host Universitas Syiah Kuala (USK) ini dilaksanakan di Pondok Pesantren Al Kautsar Al Akbar, Medan, dengan tujuan meningkatkan pengetahuan dan keterampilan santri dalam mengolah sampah organik menjadi ekoenzim sebagai produk ramah lingkungan yang bermanfaat. Metode yang digunakan adalah Asset Based Community Development (ABCD) melalui tahapan discovery, dream, design, define, dan destiny. Pelaksanaan meliputi Sosialisasi, Pelatihan pembuatan ekoenzim, pembuatan desinfektan berbahan ekoenzim, serta implementasinya pada kegiatan berkebun. Sebanyak 40 santri (15 putra dan 25 putri, rentang usia 14-17 Tahun, santri dari kelas 1, 2, 3 SMA) yang mengikuti kegiatan,  diawali dengan pre-test dan diakhiri dengan post-test. Hasil evaluasi menunjukkan peningkatan pemahaman signifikan, dengan rata-rata nilai pre-test 65,25 dan post-test 93,5. Sebanyak 95% peserta menyatakan kegiatan sangat menarik, 93% menyatakan bermanfaat, dan 89% menyatakan pemahamannya meningkat. Kegiatan ini berhasil membekali santri dengan keterampilan pengolahan sampah organik menjadi produk bernilai guna dalam bentuk eko enzim yang mendukung pertanian ramah lingkungan dan mitigasi masalah ketahanan pangan di lingkungan pesantren. Kata kunci: ekoenzim; pengolahan sampah organik; pertanian ramah lingkungan; pengabdian masyarakat. Abstract The Indonesian Collaboration Community Service (ICCS) of University Sumatera Utara Programme 2025 as co-hosy qith host was University Syiah Kuala (USK) was conducted at Pondok Pesantren Al Kautsar Al Akbar, Medan, aiming to enhance students’ knowledge and skills in processing organic waste into eco-enzyme, an environmentally friendly and beneficial product. The program adopted the Asset Based Community Development (ABCD) method through five stages: discovery, dream, design, define, and destiny. Activities included awareness sessions, eco-enzyme production training, eco-enzyme-based disinfectant preparation, and its application in gardening activities. A total of 40 students (15 males and 25 females, age rates was 14-17 years old, consit of 1, 2, 3 SMA students),  starting with a pre-test and ending with a post-test. Evaluation results indicated a significant improvement in understanding, with average pre-test and post-test scores of 65.25 and 93.5, respectively. Furthermore, 95% of participants stated the program was very interesting, 93% found it beneficial, and 89% reported increased comprehension. This program successfully equipped students with skills in organic waste processing into value-added products, while supporting environmentally friendly agriculture and contributing to food security resilience in the pesantren environment. Keywords: eco-enzyme; organic waste processing; community service; environmentally friendly agriculture.
Arrangement of Beauty in the Sweembath Tourism Environment to Achieve Community Welfare Farida, Farida Ariani; Tugiman, Tugiman; Hariadi , Hariadi Susilo; Dardanila, Dardanila; Saib , Saib Suwilo; Tulus, Tulus; Eva, Eva Sartini Bayu; Ma'ruf, Ma'ruf Tafsin; Amlys, Amlys Syahputra Silalahi
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 5 No. 2 (2020): ABDIMAS TALENTA : Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.161 KB) | DOI: 10.32734/abdimastalenta.v5i2.5223

Abstract

Repair and construction of facilities and infrastructure for the tourist area of ​​the Sweembath is aimed at increasing the attractiveness of tourists who will visit. This is one of the physical perceptions of what facilities there are in these attractions. Perceptions of the physical function of adequate beauty arrangement, such as the function of facilities and infrastructure, self-power (motivation) of the environment which are factors in tourism development to realize social welfare. Arrangement of beauty in the environment in the tourist area of ​​the sweembath by Binaan Simalungun Village, USU's LPPM, namely (1) installing ceramics along the edge of the pool, (2) painting bridges, (3) making slides and speedboats (4) Installation of life guard chairs ), (4) painting of the outer wall at the entrance to the sweembath, (5) replacing the barrier zinc, (6) the place of purchase and ticket cutting. Improvements and making arrangements for beauty facilities form an impact in the form of responses from collective or individual subjects, such as 1) the presence of visitors who take advantage of the facilities, 2) parking attendants who regulate vehicle parking 3) merchants who sell types of merchandise, 3) Rental of premises, mats, life jackets and changing rooms. The arrangement of this beauty, affects the increase in the welfare of the community, managers and traders in the Sweembath environment.
APPLICATION OF SUPPORT VECTOR MACHINE ON DROUGHT CODE CLASSIFICATION IN NORTH SUMATRA INDONESIA Butar Butar, Kartika Dewi; Sihombing, Poltak; Tulus, Tulus
Indonesian Physical Review Vol. 6 No. 1 (2023)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v6i1.196

Abstract

This study aims to classify the Drought Code in North Sumatra. Drought Code is part of Fire Danger Rating System (FDRS) developed in Canada. One of the sub-systems of FDRS is Fire Weather Index (FWI) that aims to evaluate fire hazards from current and past weather conditions. Drought Code is classified by using Support Vector Machine. Support Vector Machine is widely used in the data classification process. One of the advantages of Support Vector Machine methods is it has ability in classifying large amount of data and classifying more than two classes or multi-classes.  Weather parameters used in this study are rainfall and temperature in North Sumatra. The data used are from 8 (eight) meteorological observation stations in North Sumatra from 2017 to 2021. Drought Code is carried out with several tests using several kernels contained in SVM.
Co-Authors Abdul Aziz Ahmad Ameilia Zuliyanti Siregar Amlys, Amlys Syahputra Silalahi Aunurrahman Aunurrahman Badawi, Afif Budhiarti Nababan, Erna Butar Butar, Kartika Dewi Christian Sinaga, Christian Christy, Claudia Dahlan, Hesti Dardanila, Dardanila Dewi, Rafiqa Efendi, Syahril Erna Budhiarti Nababan Eva, Eva Sartini Bayu Farida Ariani Halida Halida Hariadi , Hariadi Susilo Herman Mawengkang Indera Sakti Nasution Liana Liana Lubis, Rahmi Suliani Ma'ruf, Ma'ruf Tafsin Mahidin Mahidin Mardiningsih Mardiningsih Marpaung, Rony Genevent Melinda Melinda Meutia Nauly Muhammad Zarlis, Muhammad Muhibbuddin Muhibbuddin Muhibuddin Muhibuddin, Muhibuddin Mulya, Hadi Nababan, Junerdi Nabiyah, Ismi Ratin Napitu, Daniel Halomoan Saragi Nasrul Arahman Nasrul Nasrul Panjaitan, Nismah Poltak Sihombing Putri, Mimmy Sari Syah Ramli, Ichwana Saib Suwilo Salim, Opim Sawaluddin Sawaluddin, Sawaluddin Siregar, Netti Herlina Suharno Suharno Sulastri Sulastri Syahputra, Indra Edy Syamsul Arifin Tugiman Tugiman Wigati, Ndaru Zakarias Situmorang Zarlis, M Zulkifli Nasution