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All Journal Abdi Wina : Jurnal Pengabdian Kepada Masyarakat Universitas Kristen Wira Wacana Sumba Journal of Information Technology, Software Engineering and Computer Science d'Cartesian: Jurnal Matematika dan Aplikasi Jurnal Informatika dan Rekayasa Perangkat Lunak
Mans Lumiu Mananohas
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Public Health Social Sciences Veterinary

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MASALAH TONGKAT DAN TALI : KARDIOID VERSUS ELIPS Mans Lumiu Mananohas
d\'Cartesian: Jurnal Matematika dan Aplikasi Vol. 3 No. 2 (2014): September 2014
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/dc.3.2.2014.5457

Abstract

Abstrak Sebuah tali dengan panjang tertentu diikatkan ke sebuah tongkat dengan panjang juga tertentu tepat pada tiap ujungnya. Di sini kedua ujung tali masing-masing  harus tepat berada di kedua ujung tongkat. Akan dicari bentuk tali yang memaksimumkan luas antara tali dan tongkat. Solusi yang diinginkan di sini adalah  kurva berbentuk fungsi . Masalah ini akan dikaji untuk panjang tongkat 1 satuan. Untuk kasus panjang tali   telah ditemukan solusinya, yaitu segmen lingkaran. Akan tetapi solusi berupa segmen lingkaran sudah tidak berlaku lagi untuk kasus . Pada penelitian sebelumnya, telah diperiksa beberapa keluarga kurva, dimana segmen elips memberikan luas paling besar. Pada penelitian ini penulis tertarik untuk memeriksa segmen kardioid. Hasilnya terdapat kasus dengan panjang yang sama, yakni 1.539600718, dimana segmen kardioid membentuk luas yang lebih besar bila dibandingkan dengan segmen elips.   Kata kunci :Masalah Dido, masalah tongkat dan tali, maksimum, kardioid, elips.
Web-Based Tracer Study Information System Development Using Rapid Application Development for Alumni Data Management in FMIPA UNSRAT Timothy Salomo Van Dijken Boediman; Chriestie Ellyane Juliet Clara Montolalu; Dodisutarma Lapihu; Mahardika Inra Takaendengan; Mans Lumiu Mananohas; Rillya Arundaa
Jurnal Informatika dan Rekayasa Perangkat Lunak Vol. 6 No. 3 (2025): Volume 6 Number 3 September 2025
Publisher : Universitas Teknokrat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33365/jatika.v6i3.305

Abstract

Tracer studies are essential tools for evaluating the relevance and quality of higher education curricula, as they facilitate the tracking of alumni career outcomes. However, the conventional utilization of Google Forms for data collection in the Information Systems Study Program at FMIPA UNSRAT has led to fragmented and inefficient alumni data management. The objective of this research is to develop a web-based tracer study information system to enhance the efficiency and accuracy of alumni data management. The system's development employed the Rapid Application Development (RAD) method, which prioritizes iterative prototyping and active stakeholder involvement. The research process entailed a multifaceted approach, encompassing a needs analysis, system design, implementation, and black-box testing to ensure system reliability. The resulting web-based system enables alumni to complete dynamic questionnaires according to their employment status, while administrators can efficiently manage and visualize alumni data through interactive dashboards. The system's structured data collection and visualization features support program evaluation and accreditation processes. Preliminary testing results indicate that the system functions as intended and significantly enhances the management and utilization of alumni data. The present study demonstrates that the integration of RAD and web-based technology provides a practical solution for tracer study implementation in higher education institutions.
Implementation of IOT-Based Chili Plant Watering System Prototype with BLYNK Control Cessi Rumondor; Mans Lumiu Mananohas; Rillya Arundaa; Eric Alfonsius
Jurnal Informatika dan Rekayasa Perangkat Lunak Vol. 6 No. 3 (2025): Volume 6 Number 3 September 2025
Publisher : Universitas Teknokrat Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33365/jatika.v6i3.483

Abstract

This research aims to design and implement a prototype of an Internet of Things (IoT)-based dual-mode irrigation system for chili plants, integrating automatic and manual control via the Blynk application. The background of this study is the need for efficient water management in chili farming, which is often constrained by traditional manual irrigation methods. The system is built using a NodeMCU ESP32 microcontroller connected to a capacitive soil moisture sensor, DHT11 sensor, and relay modules that control water and fertilizer pumps. The research method uses a prototyping model to design, build, and test the irrigation system. Real-time sensor data is transmitted to the Blynk dashboard, allowing farmers to monitor environmental conditions and control the pumps either automatically (based on threshold logic) or manually via smartphone. The calibration results show that the soil moisture sensor achieves 93.5% accuracy. Testing using the black-box method confirms that all system components function as expected, with responsive performance both in automatic and manual modes. The findings demonstrate that the dual-mode IoT-based irrigation system can maintain optimal soil moisture levels while providing flexibility for farmers to override the system based on real-world conditions. This hybrid solution offers a practical approach to modern agriculture, improving decision-making and efficiency in crop watering practices.
Design and Implementation of a Blockchain-Based Digital Gold Trading System for Transaction History Recording Gaizka Mendieta Bawias; Mans Lumiu Mananohas; Edwin Tenda
Journal of Information Technology, Software Engineering and Computer Science (ITSECS) Vol. 4 No. 3 (2026): Volume 4 Number 3 July 2026
Publisher : PT. Tech Cart Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58602/itsecs.v4i3.379

Abstract

Digital gold services depend on transaction histories because every purchase or sale changes a user's rupiah and gold balances. A centralized database supports efficient operations, but it does not by itself provide users with an independently verifiable record outside the operator's system. This study developed a web-based prototype that uses Ethereum Sepolia as a supplementary evidence layer for approved digital gold transactions. The study followed an applied system-development approach and the Waterfall model, supported by a literature review and observation of common digital gold workflows. The prototype separates end-user and administrator roles. Buy and sell requests remain pending until administrative review; rejected requests do not alter balances, whereas approved requests are submitted through MetaMask to a Solidity smart contract. The resulting transaction hash and block number are retained with the operational history in MySQL. The application was implemented with React, TypeScript, Tailwind CSS, Node.js, and Express.js. Black-box testing covered 24 application scenarios and nine blockchain-integration scenarios. All 33 scenarios passed, including insufficient-balance handling, role separation, approval and rejection states, purchase and sale recording, explorer verification, and consistency between the application ledger and Sepolia evidence. The results demonstrate the feasibility of using a public testnet as an additional transaction-evidence layer rather than as a replacement for the operational database. However, the prototype uses simulated balances and prices and does not establish the existence of physical gold or production-level security, scalability, and economic viability.
PEMBUATAN DAN PELATIHAN PENGGUNAAN WEBSITE PROFIL SEKOLAH DENGAN FITUR FOTO 360 SEBAGAI MEDIA INFORMASI INTERAKTIF DI SMP NEGERI 2 KALAWAT Dodisutarma Lapihu; Mans Lumiu Mananohas; Amalludin; Mahardika Inra Takaendengan; Yalon Bu’tu Pagewang; Juticia Natania Toar; Darlene Syaroon Asalui; Graciela Anggreiny Kumajas; Chintya Jennifer Kamal
ABDI WINA JURNAL PENGABDIAN KEPADA MASYARAKAT Vol. 6 No. 1 (2026): Abdi Wina Edisi Juni 2026
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Kristen Wira Wacana Sumba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58300/522nbz14

Abstract

SMP Negeri 2 Kalawat menghadapi tantangan dalam menyampaikan informasi secara komprehensif dan interaktif kepada siswa, orang tua, dan masyarakat. Berdasarkan analisis kebutuhan, sekolah ini masih mengandalkan metode komunikasi konvensional seperti papan pengumuman yang memiliki keterbatasan jangkauan dan frekuensi, diperparah dengan rendahnya kompetensi digital guru dalam mengelola platform informasi berbasis teknologi. Penelitian ini bertujuan mengembangkan solusi digital berupa website profil sekolah yang dilengkapi dengan fitur foto 360 derajat sebagai media komunikasi yang dinamis dan informatif. Metode pelaksanaan PKM ini mengadopsi pendekatan kolaboratif yang melibatkan partisipasi aktif dari pihak sekolah, terdiri dari lima fase utama: (1) Persiapan dan Analisis Kebutuhan, (2) Pelatihan Teknis, (3) Pendampingan Implementasi, (4) Monitoring dan Evaluasi, dan (5) Publikasi dan Dokumentasi. Website dikembangkan menggunakan framework CodeIgniter 4 dengan arsitektur MVC. Hasil evaluasi menggunakan System Usability Scale (SUS) menunjukkan skor 82.5 yang berada dalam kategori "Excellent", menunjukkan tingkat usability yang sangat baik. Evaluasi juga mengungkapkan peningkatan kompetensi digital guru sebesar 65% dan peningkatan kepuasan pengguna website sebesar 78%. Website yang dikembangkan mampu menyajikan informasi sekolah secara lebih komprehensif, termasuk foto 360 derajat dari berbagai fasilitas sekolah seperti ruang kelas, laboratorium, perpustakaan, dan lapangan olahraga. Implementasi website profil sekolah dengan fitur foto 360 terbukti efektif dalam meningkatkan transparansi informasi, dokumentasi fasilitas sekolah, dan promosi kelembagaan SMP Negeri 2 Kalawat. Keberhasilan program ini membuktikan bahwa pendekatan pelatihan intensif yang diikuti pendampingan praktis sangat efektif dalam meningkatkan kapasitas sekolah dalam mengadopsi teknologi digital.
Co-Authors Alfonsius, Eric Amalludin Cessi Rumondor Chintya Jennifer Kamal Chriestie Ellyane Juliet Clara Montolalu Darlene Syaroon Asalui Dodisutarma Lapihu Gaizka Mendieta Bawias Graciela Anggreiny Kumajas Juticia Natania Toar Mahardika Inra Takaendengan Mahardika Inra Takaendengan Rillya Arundaa Tenda, Edwin Timothy Salomo Van Dijken Boediman Yalon Bu’tu Pagewang