Judul: LoRa Communication Performance Analysis with RFM95W Module for Chicken Coop Environmental Monitoring
Abstrak: IoT technology can make it easier for farmers to monitor the chicken coop from afar. One of the technologies is LoRa which is suitable for long-distance communication and is efficient in power usage. This study aims to implement and test the performance of IoT using LoRa with the RFM95W module in a chicken coop environment. Performance observed in the form of distance, signal strength, and success of data transmission. The tests carried out are functional testing and performance testing with 3 and 5 dBi antennas. The results of functional testing successfully send data to Thingspeak. Performance testing with a 3 dBi antenna, the results were less consistent and the distance was lower, even though had changed from SF7 to SF10. Meanwhile, performance experiments with the 5 dBi antenna on the SF7 obtained results for scenarios without obstructions that could reach 400 m with an error rate of 15% and reached 80 m for scenarios with obstacles with an error rate of 5%., Teknologi IoT dapat mempermudah peternak dalam memantau kandang ayam dari jauh. Salah satu teknologinya adalah LoRa yang cocok untuk komunikasi jarak jauh serta hemat dalam penggunaan daya. Penelitian ini bertujuan untuk mengimplementasikan dan menguji kinerja IoT menggunakan LoRa dengan modul RFM95W pada lingkungan kandang ayam. Kinerja yang diamati berupa jarak, kekuatan sinyal, dan keberhasilan transmisi data. Pengujian yang dilakukan adalah pengujian fungsional dan pengujian kinerja dengan antena 3 dan 5 dBi. Hasil pengujian fungsional berhasil mengirimkan data ke Thingspeak. Pengujian kinerja dengan antena 3 dBi mendapatkan hasil yang kurang konsisten dan jarak yang rendah meskipun sudah mengubah SF7 ke SF10. Sementara, percobaan kinerja dengan antena 5 dBi pada SF7 mendapakan hasil yang lebih baik, yaitu untuk skenario tanpa halangan dapat mencapai 400 m dengan error rate 15% dan mencapai 80 m untuk skenario dengan halangan dengan error rate 5%.
Keyword: analisis kinerja, lingkungan kandang, LoRa, RFM95W

Judul: Soil Temperature and Moisture Monitoring System Using LoRa Communication: Case Study on the Impact of Plastic Mulching
Abstrak: Budidaya pertanian memerlukan pemantauan intensif dari penanaman hingga panen. Dalam penelitian ini, sistem monitoring suhu dan kelembaban tanah menggunakan teknologi LoRa (Long Range) dikembangkan untuk memberikan informasi real-time tentang kondisi lingkungan pertanian. Sensor suhu DS18B20 menunjukkan bahwa penggunaan mulsa menurunkan suhu rata-rata tanah dari 31,25 ? (tanpa mulsa 35,77 ?) pada hari pertama menjadi 30,71 ? (tanpa mulsa 33,15 ?) pada hari kedua. Sensor kelembaban tanah FC-28 menunjukkan penggunaan mulsa mengurangi kelembaban rata-rata dari 342 (tanpa mulsa 402) pada hari pertama menjadi 276 (tanpa mulsa 302) pada hari kedua. Pengujian LoRa selama dua hari dengan jarak 400 Meter menunjukkan bahwa sistem ini efektif dalam memantau dan mengontrol kondisi tanah untuk mendukung pertumbuhan tanaman., Agricultural cultivation requires intensive monitoring from planting to harvest. In this study, a soil temperature and moisture monitoring system using LoRa technology was developed to provide real-time information on agricultural environmental conditions. The DS18B20 temperature sensor indicated that mulching reduced average soil temperatures from 31.25 ? (without mulch 35.77 ?) on the first day to 30.71 ? (without mulch 33.15 ?) on the second day. The FC-28 soil moisture sensor showed that mulching decreased average moisture levels from 342 (without mulch 402) on the first day to 276 (without mulch 302) on the second day. LoRa testing over two days with a distance of 400 meters demonstrated that the system is effective in monitoring and controlling soil conditions to support plant growth.
Keyword: kelembaban tanah, LoRa, sensor kelembaban tanah FC-28, sensor suhu DS18B20, suhu tanah

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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