2021 4th International Seminar on Research of Information Technology and Intelligent Systems (ISRITI)

The proceedings contain 114 papers. The topics discussed include: mechanical vibration control and second-order LTI system analysis of an SDOF with harmonic motion;operating switched reluctance motor in proper excitation angles;sentiment analysis in Indonesian on Jakarta culinary as a recommender system;firebase authentication cloud service for RESTful API security on employee presence system;recommendation system for elective courses using content-based filtering and weighted cosine similarity;sentiments analysis of Indonesian tweet about covid-19 vaccine using support vector machine and fasttext embedding;and solving the capacitated vehicle routing problem (CVRP) with guided local search and simulated annealing for optimizing the distribution of fishing vessels.