Personal IT portal of Eko Teguh Widodo featuring technical articles, research insights, and explorations in Artificial Intelligence.https://ekotwidodo.github.io/en-ushttps://ekotwidodo.github.io/articles/2026-10-12-understanding-rdf-and-turtle-knowledge-as-triples/https://ekotwidodo.github.io/articles/2026-10-12-understanding-rdf-and-turtle-knowledge-as-triples/Learn how to represent entities, values, and relationships using RDF, write semantic data with Turtle, and build your first RDF graph with Python.Mon, 12 Oct 2026 02:00:00 GMTSemantic WebSemantic WebRDFTurtleKnowledge GraphsLinked DataPythonRDFLibKnowledge Representationhttps://ekotwidodo.github.io/articles/2026-10-12-semantic-web-explained-rdf-linked-data/https://ekotwidodo.github.io/articles/2026-10-12-semantic-web-explained-rdf-linked-data/Understanding how machines can work with structured meaning, connect information across different sources, and build a more interoperable Web.Mon, 12 Oct 2026 01:00:00 GMTSemantic WebSemantic WebRDFLinked DataKnowledge GraphsSPARQLOntologyKnowledge RepresentationData Integrationhttps://ekotwidodo.github.io/articles/2026-10-11-building-your-first-rest-api-fastapi-uv/https://ekotwidodo.github.io/articles/2026-10-11-building-your-first-rest-api-fastapi-uv/From zero to a working REST API: learn how to build, validate, test, and run a production-ready Python API using FastAPI and uv.Sun, 11 Oct 2026 15:15:00 GMTBackend EngineeringPythonFastAPIuvREST APIBackend DevelopmentAPI DevelopmentSoftware Engineeringhttps://ekotwidodo.github.io/articles/2026-10-11-setting-up-data-science-environment-uv-jupyter-pandas/https://ekotwidodo.github.io/articles/2026-10-11-setting-up-data-science-environment-uv-jupyter-pandas/From a clean Python environment to interactive exploratory data analysis: a practical, reproducible workflow for data science practitioners using uv, JupyterLab, pandas, and Matplotlib.Sun, 11 Oct 2026 14:36:00 GMTData SciencePythonuvData ScienceJupyterLabpandasData Visualizationhttps://ekotwidodo.github.io/articles/2026-10-11-from-script-to-project-practical-workflow-with-uv/https://ekotwidodo.github.io/articles/2026-10-11-from-script-to-project-practical-workflow-with-uv/Learn how to transform a scrappy Python script into a structured, maintainable, and testable CLI application using uv. We build Text Inspector from the ground up with modular code, CLI entry points, and automated pytest suites.Sun, 11 Oct 2026 14:28:00 GMTSoftware EngineeringPythonuvSoftware EngineeringPython DevelopmentTest Automationhttps://ekotwidodo.github.io/articles/2026-10-11-understanding-pyproject-toml-uv-lock-and-venv/https://ekotwidodo.github.io/articles/2026-10-11-understanding-pyproject-toml-uv-lock-and-venv/Demystifying the foundational triad that makes modern Python projects structured, reproducible, and portable across machines. Learn how configuration, lockfiles, and virtual environments work together under the hood.Sun, 11 Oct 2026 13:55:00 GMTSoftware EngineeringPythonuvProject ManagementDependency ManagementSoftware Engineeringhttps://ekotwidodo.github.io/articles/2026-10-11-getting-started-with-uv-python-environment/https://ekotwidodo.github.io/articles/2026-10-11-getting-started-with-uv-python-environment/Say goodbye to wrestling with Python versions, virtual environments, and slow dependency resolvers. Here is a step-by-step walkthrough for configuring uv, structuring projects, and running Python code seamlessly.Sun, 11 Oct 2026 13:30:00 GMTSoftware EngineeringPythonuvDeveloper ToolsEnvironment ManagementDevOpshttps://ekotwidodo.github.io/articles/2024-08-24-belajar-visualisasi-data-r-ggplot2-patchwork-diagram/https://ekotwidodo.github.io/articles/2024-08-24-belajar-visualisasi-data-r-ggplot2-patchwork-diagram/Kuasai ekosistem visualisasi modern di R berbasis Grammar of Graphics: eksplorasi mendalam ggplot2 dari konsep layering geom_*, faceting, custom theme, komposisi multi-plot dengan patchwork, hingga diagram aliran data tingkat lanjut (Sankey & Chord Diagram).Sat, 24 Aug 2024 02:00:00 GMTData ScienceRVisualisasi Dataggplot2Data ScienceStatistikaData AnalyticsRStudiohttps://ekotwidodo.github.io/articles/2024-08-23-panduan-visualisasi-data-di-r-grafik-dasar-plot/https://ekotwidodo.github.io/articles/2024-08-23-panduan-visualisasi-data-di-r-grafik-dasar-plot/Pelajari seni visualisasi data menggunakan sistem grafik dasar (base graphics) di R: eksplorasi mendalam fungsi plot(), barplot(), pie(), hist(), boxplot(), hingga perancangan dashboard multi-plot 2x2 dengan studi kasus nyata.Fri, 23 Aug 2024 02:00:00 GMTData ScienceRVisualisasi DataData ScienceStatistikaData AnalyticsRStudiohttps://ekotwidodo.github.io/articles/2024-08-21-memahami-struktur-data-bahasa-r-vektor-list-dataframe-matriks/https://ekotwidodo.github.io/articles/2024-08-21-memahami-struktur-data-bahasa-r-vektor-list-dataframe-matriks/Kupas tuntas 6 struktur data fundamental di R: subsetting vektor tingkat lanjut, manipulasi nested list & functional programming, data wrangling tabel Data Frame, operasi aljabar linier matriks, hingga pemodelan faktor kategorikal.Wed, 21 Aug 2024 02:00:00 GMTData ScienceRData ScienceStruktur DataData WranglingRStudioStatistikahttps://ekotwidodo.github.io/articles/2024-08-20-belajar-dasar-pemrograman-r-analisis-data/https://ekotwidodo.github.io/articles/2024-08-20-belajar-dasar-pemrograman-r-analisis-data/Pelajari dasar-dasar bahasa R untuk komputasi statistik dan sains data secara terstruktur: mulai dari deklarasi variabel, manipulasi vektor, logika percabangan, looping, hingga fungsi rekursif dan lexical scoping.Tue, 20 Aug 2024 02:00:00 GMTData ScienceRData ScienceStatistikaProgrammingRStudioData Analysis