Judul: Sistem Deteksi dan Kuantifikasi Pakan Ikan Berbasis Computer Vision
Abstrak: Pemberian pakan yang berlebihan pada kolam budidaya ikan dapat menyebabkan berbagai masalah, seperti pemborosan pakan, pencemaran lingkungan, dan penurunan kualitas ikan yang dihasilkan. Oleh karena itu, sangat penting untuk mengoptimalkan pemberian pakan pada kolam budidaya guna meningkatkan efisiensi biaya dan kualitas ikan. Sebuah sistem inovatif diperkenalkan dengan menggunakan teknologi berbasis computer vision. Sistem ini mampu memberikan informasi yang akurat mengenai penggunaan pakan ikan, sehingga para pembudidaya ikan dapat mengoptimalkan pengelolaan pakan. Tujuan penelitian ini adalah mengembangkan instrumen sistem deteksi dan kuantifikasi pakan ikan berbasis computer vision, melakukan sistem deteksi pakan ikan menggunakan model YOLOv5x, serta menghitung efektivitas sistem deteksi pakan ikan. Pengembangan instrumen Automatic feeder dan komponen kamera OAK-D telah menunjukkan hasil yang baik. Perbandingan antara waktu RTC dengan waktu aktual menunjukkan tidak ada perbedaan yang signifikan di antara keduanya. Dalam penelitian ini menggunakan motor stepper, yang mana setiap 5 putaran mengeluarkan sekitar 30 gram pakan ikan. Pengujian sensor loadcell menunjukkan rata-rata error sebesar 0,09%. Hal ini menunjukkan bahwa sensor loadcell memberikan nilai berat yang hampir sama dengan timbangan konvensional. Kombinasi Automatic feeder dan komponen kamera OAK-D dengan memanfaatkan model YOLOv5x menunjukkan tingkat akurasi sebesar 0.82 atau 82%. Hasil ini memberikan keyakinan bahwa model ini dapat dipercaya dalam menghitung objekpakan ikan dengan hasil yang baik. Hasil penghitungan pakan ikan pada waktu pagi di menit ke 5, 10, 15, 20, 25, dan 30 menunjukkan rata-rata jumlah pakan ikan (butir) sebesar 64, 38, 18, 9, 5, dan 0. Pada waktu siang di menit ke 5, 10, 15, 20, 25, dan 30, rata-rata pakan ikan (butir) adalah 65, 37, 18, 7, 7, dan 0. Pada waktu sore di menit ke 5, 10, 15, 20, 25, dan 30, rata-rata pakan ikan (butir) adalah 59, 35,16, 8, 4, dan 0. Dilihat dari tabel waktu habisnya pakan ikan, rata-rata pakan ikan habis pada menit ke-25 pada pagi, siang, dan sore hari.
Keyword: Automatic Feeder, Computer Vision, OAK-D camera, YOLOv5x

Judul: Analisis Penggunaan Semi-Automatic Feeder terhadap Kinerja Usaha Budidaya Ikan Lele (Clarias sp.) di CV Vatra Mandiri Agro, Depok
Abstrak: Tren peningkatan produksi ikan lele diiringi dengan peningkatan kebutuhan dan harga pakan. Hal ini akan berakibat pada tingginya biaya produksi ikan lele. Salah satu solusi penghematan dapat dilakukan dengan penekanan biaya tenaga kerja dengan penggunaan semi-automatic feeder. Penelitian ini bertujuan menganalisis produktivitas tenaga kerja pada metode pemberian pakan dengan penggunaan semi-automatic feeder dan manual feeding dalam usaha pembesaran ikan lele. Perlakuan pada penelitian ini, yaitu kolam dengan manual feeding (A) dan kolam dengan semi-automatic feeder (B), masing-masing dengan 3 ulangan. Ikan lele dengan bobot 3,4 ± 0,82 g dan panjang 7,8 ± 0,65 cm dipelihara dalam kolam berukuran 8 m x 12 m x 0,65 m dengan padat tebar 481 ekor/m3. Selama 83 hari pemeliharaan, ikan diberi pakan tiga kali sehari. Mesin feeder menyemprotkan pakan dengan kecepatan 16 g/detik. Data pertumbuhan diambil sebanyak lima kali dalam 83 hari masa pembesaran. Hasil penelitian menunjukkan bahwa parameter tingkat kelangsungan hidup (TKH), laju pertumbuhan mutlak panjang (LPMP), dan laju pertumbuhan mutlak bobot (LPMB) berpengaruh nyata, sedangkan jumlah konsumsi pakan (JKP), rasio konversi pakan (RKP), dan total panen tidak menunjukkan perbedaan pada budidaya ikan lele. Berdasarkan indikator produktivitas tenaga kerja menunjukkan usaha pembesaran ikan lele dengan semiautomatic feeder memiliki produktivitas yang lebih tinggi yang lebih tinggi., The increasing trend in catfish production aligns with an increase in feed demand and price. This contributes to the higher overall production cost. One cost- saving solution is by suppressing the labour cost through the use of semi-automatic feeder. This research aims to analyse labour productivity in the method of feeding using semi-automatic feeders and manual feeding in the catfish farming business. The treatments in this research were ponds with manual feeding (A) and ponds with semi-automatic feeders (B), each with 3 replicates. Catfish at initial weight of 3.4 ± 0.82 g and a length of 7.8 ± 0.65 cm were reared in ponds measuring 8 m x 12 m x 0.65 m with a stocking density of 481 fish/m3. During the 83 days of cultivation, the fish were fed three times a day. The automatic feeder dispensed feed at a rate of 16 g/second. Growth data were collected five times during the 83-day growth period. The research results show that survival rate (TKH), absolute growth rate in length (LPMP), and absolute growth rate in weight (LPMB) had a significant effect, while feed consumption (JKP), feed conversion ratio (RKP), and total harvest did not show any differences in catfish farming. Based on labor productivity parameters, catfish farming with semi-automatic feeders showed higher productivity.
Keyword: business, catfish, culture, semi-automatic feeder

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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