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All Journal International Journal of Electrical and Computer Engineering Bulletin of Electrical Engineering and Informatics MUQTASID 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 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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Hybrid Cryptosystem Analysis RSA Algorithm And Triple DES Algorithm Liana, Liana; Zarlis, Muhammad; Tulus, Tulus
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 3 (2023): Article Research Volume 7 Issue 3, July 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.12467

Abstract

Data security is needed in terms of communication. To guarantee data security, a technique is needed to make data and information called Critography. This study aims to analyze the process of Super Encryption in symmetric and asymmetric criterias using the Triple DES Algorithm and the RSA Algorithm. This can improve data security so that data is more confidential. The method used in Triple DES which is also called the symmetric algorithm is the OFB (Output feeback) method, and the RSA Algorithm (Riverst - Shamir-Adleman) which is an asymmetric algorithm using a random number system so that when these two algorithms are combined in the Super Encryption process the more accurate the data security. Super DES Triple Encryption and RSA algorithm analysis shows that the data created by text will be encrypted into ciphertext using both methods and re-described, so that the security of the data is relatively safe. Super Encryption on the two methods Algorithm is done because the level of complexity is difficult to make Cryptanalysts to steal data and the Encryption process becomes slow but data security becomes safer and not easy to attack Cryptanalysts. The problem in this research is how to increase encryption security and speed up the encryption process by combining the RSA and Triple DES methods.
Finite Element Model of Rock Obstruction on Overtopping at the Coastline Marpaung, Rony Genevent; Tulus, Tulus; Mardiningsih, Mardiningsih
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 3 (2023): Article Research Volume 7 Issue 3, July 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.12630

Abstract

Wave overtopping is a common phenomenon that occurs during extreme sea conditions, where water waves travel over the surface of an open structure towards the sea and pass over its crest. To prevent flooding and coastal erosion, rock structures are often constructed as wave barriers along the shore. These barriers serve as a solution to mitigate wave overtopping. One of the key factors influencing overtopping is the arrival of continuous and sufficiently high-water waves that can pass through the top of coastal defense structures. Several phase settlement methods have been developed and applied to analyze wave overtopping using the Navier-Stokes (NS) equation. By employing the finite element method, numerical solutions and simulations are sought by inputting specific parameter values. This process aims to validate the accuracy of the resulting mathematical model. To accomplish this, a program is developed based on the discretization of the model, enabling a system analysis approach. The obtained results exhibit minimal error values, thereby demonstrating optimal outcomes in terms of rock placement. The entire fluid mechanics system analysis is simulated using the COMSOL Multiphysics 5.6 program, which provides a comprehensive platform for studying and evaluating the performance of the wave barrier system
Simplifying Complexity: Scenario Reduction Techniques in Stochastic Programming Sinaga, Christian; Tulus, Tulus; Mawengkang, Herman
Sinkron : jurnal dan penelitian teknik informatika Vol. 7 No. 3 (2023): Article Research Volume 7 Issue 3, July 2023
Publisher : Politeknik Ganesha Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33395/sinkron.v8i3.12753

Abstract

Stochastic programming problems arise as mathematical models for optimizing problems under stochastic uncertainty. Computational approaches for solving these models often involve approximating the underlying probability distribution with a probability measure that has finite support. To mitigate the computational complexity associated with increasing the number of scenarios, it may be necessary to reduce their quantity. The scenario is selected as the first element of supp , and the separable structure is used to determine the second element of supp while keeping the first element fixed. The process is repeated to establish the remaining indices, and each subsequent scenario is reduced accordingly. This iterative process continues until scenario is reduced
(RETRACTED) The development of Newton’s method by enhancing the starting point Nabiyah, Ismi Ratin; Salim, Opim; Tulus, Tulus
International Journal of Trends in Mathematics Education Research Vol 6, No 1 (2023)
Publisher : SAINTIS Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (459.508 KB) | DOI: 10.33122/ijtmer.v6i1.205

Abstract

Reason for Retraction (February 01st, 2024):This article has been retracted by the editors due to publication ethics misconduct by authors that the authors did not have ownership of the data that they report. Ismi Ratin Nabiyah as a corresponding Author of the article and as the representative of all authors, has asked the editor to retracted this article and recognize the mistakes for him.
Discrete optimization model for multi-product multi-supplier vehicle routing problem with relaxed time window Firdaus, Muliawan; Mawengkang, Herman; Tulus, Tulus; Sawaluddin, Sawaluddin
International Journal of Electrical and Computer Engineering (IJECE) Vol 15, No 1: February 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v15i1.pp592-603

Abstract

This study examines the complicated logistics optimization issue known as the vehicle routing problem for multi-product and multi-suppliers(VRP-MPMS), which deals with the effective routing of a fleet of vehicles to convey numerous items from multiple suppliers to a set of consumers. In this problem, products from various suppliers need to be delivered to different customers while considering vehicle capacity constraints, time windows, and minimizing transportation costs. We propose a hybrid approach that combines a generalized reduced gradient method to identify feasible regions with a feasible neighborhood search to achieve optimal or near-optimal solutions. The aim of the exact method is to get the region of feasible solution. Then we explore the region using feasible neighborhood search, to get an integer feasible optimal (suboptimal) solution. Computational experiments demonstrate that our model and method effectively reduce transportation costs while satisfying vehicle capacity constraints and relaxed time windows. Our findings provide a viable solution for improving logistics operations in real-world scenarios.
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.
Empowering Local Tourism through Competitive Swimming Events for Sustainable Development at Swembath Natural Springs Tulus; T.J. Marpaung; Andrew Satria Lubis; Nicholas Marpaung; Jonathan Liviera Marpaung
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 9 No. 2 (2024): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v9i2.18286

Abstract

This article presents the results of a community empowerment project aimed at revitalizing local tourism at Swembath Natural Springs in Naga Soppa, Simalungun Regency, North Sumatra. Faced with declining visitor numbers and the need to boost local economic activity, this project integrated competitive swimming events as a new attraction while fostering sustainable development. The construction of an international-standard swimming pool served as the foundation for this initiative, offering a venue for sports tourism that attracts both athletes and recreational visitors. The project also included comprehensive training for local businesses, focusing on tourism management, digital marketing, and service improvement, thereby empowering the community to capitalize on the influx of tourists. The results show a significant increase in visitor numbers during swimming competitions, positively impacting local businesses such as food vendors, craft sellers, and accommodation providers. Moreover, the project fostered environmental conservation efforts, ensuring that the natural beauty of Swembath is preserved for future generations. This initiative aligns with Sustainable Development Goals (SDGs), particularly in terms of economic empowerment and environmental sustainability. The community now possesses the tools and infrastructure needed to maintain Swembath as a competitive tourist destination, with a sustainable model that benefits both the environment and the local economy. The project's success highlights the potential of integrating sports tourism and community-based empowerment to foster long-term economic growth and environmental stewardship.
Co-Authors Abdul Aziz Ahmad Ameilia Zuliyanti Siregar Andrew Satria Lubis Aunurrahman Aunurrahman Badawi, Afif Bambang Trisakti Budhiarti Nababan, Erna Christian Sinaga, Christian Christy, Claudia Dahlan, Hesti Destanul Aulia, SKM., MBA., M.Ec., Ph.D Dewi, Rafiqa Efendi, Syahril Elviwani Freddy Sutanto Halida Halida Herman Mawengkang Indera Sakti Nasution Irvan J.L. Marpaung Jonathan Liviera Marpaung Liana Liana M.R. Syahputra Mahidin Mahidin Mardiningsih Mardiningsih Marpaung, Nicholas Marpaung, Rony Genevent Melinda Melinda Meutia Nauly Muhammad Zarlis, Muhammad Muhibbuddin Muhibbuddin Muhibuddin Muhibuddin, Muhibuddin Mulya, Hadi Nababan, Junerdi Nabiyah, Ismi Ratin Nasrul Arahman Nasrul Nasrul Nurzainah Ginting Panjaitan, Nismah Putri, Mimmy Sari Syah Ramli, Ichwana Rivaldi Sidabutar Rony Marpaung Saib Suwilo Saib Suwilo Salim, Opim Sawaluddin Nasution Sawaluddin Sawaluddin, Sawaluddin Siregar, Netti Herlina Suharno Suharno Sulastri Sulastri Suriati Syahputra, Indra Edy Syamsul Arifin T.J. Marpaung Wigati, Ndaru Zakarias Situmorang Zulkifli Nasution