Judul: Early Warning System for Water Quality Parameters in  Tilapia Aquaculture Based on IoT
Abstrak: Akuakultur ialah bentuk upaya produksi biota atau organisme perairan menggunakan penerapan teknik domestikasi. Salah satu akuakultur yang popular adalah budidaya ikan nila. Kondisi alam, kemudahan dalam membudidayakannya dan permintaan pasar yang tinggi pada akhirnya menggiring ikan nila menjadi komoditas yang potensial. Pemantauan kualitas air pada kolam budidaya ikan nila saat ini masih banyak dilakukan dengan cara manual dengan langsung mengukur kualitas air ke kolam budidaya, hal ini tentunya tidak efektif dan memerlukan waktu yang lama serta tidak efisien. Pembuatan sistem pengukuran dan monitoring parameter kualitas air pada budidaya perikanan berbasis Internet of Things ini dapat membantu pemilik dalam proses pengukuran dan pemantauan dimana hasil pemantauan dan kontrolnya dapat dilakukan menggunakan website. Waktu pemantauan dan pengukuran suhu, TDS, pH, dan dissolved oxygen dilakukan selama 1 hari pada pukul 09.00, 14.00, dan 17.00. Suhu dalam proses pemantauan kolam berada pada kategori aman, TDS berada pada kategori aman, pH berada pada kategori peringatan dan dissolved oxygen pada kategori berbahaya., Aquaculture is a form of aquatic organism production that involves the application of domestication techniques. One popular form of aquaculture is the cultivation of tilapia fish. The natural conditions, ease of cultivation, and high market demand have made tilapia fish a potential commodity. Currently, monitoring the water quality in tilapia fish cultivation ponds is often done manually by directly measuring the water quality in the ponds, which is neither effective nor efficient. The development of an Internet of Things-based system for measuring and monitoring water quality parameters in fisheries can assist owners in the measurement and monitoring process, with the results accessible through a website. Water quality parameters such as temperature, total dissolved solids (TDS), pH, and dissolved oxygen were monitored during the day at 09:00, 14:00, and 17:00. Temperature was within the safe category, TDS was in the safe category, pH was in the warning category, and dissolved oxygen was in the dangerous category.
Keyword: Monitoring, Tilapia fish, Water quality, Website

Judul: Smart Water Quality Monitoring System for Controlling Vegetable Nutrient Needs in Aquaponic Farming
Abstrak: Akuaponik merupakan kombinasi budidaya akuakultur dan budidaya hidroponik dalam satu tempat dimana kotoran ikan dapat dimanfaatkan sebagai sumber nutrisi bagi sayuran. Dalam upaya memaksimalkan peluang pengembangan akuaponik yang ada, maka perlu diterapkan teknologi untuk melakukan monitoring secara berkala terhadap kondisi kualitas air kolam ikan yang akan dialirkan ke pipa berisi sayuran. Pembuatan sistem terkendali monitoring kualitas air dapat membantu petani untuk mengontrol kebutuhan nutrisi sayuran pada budidaya akuaponik dimana hasil monitoring dan kontrolnya dapat dilakukan melalui website. Pada penelitian ini, ikan nila dan pakcoy dipilih karena keduanya memiliki kebutuhan kondisi lingkungan yang cocok. Waktu pengukuran dilakukan selama 30 hari pada jam 07.30 dan 17.30. Pemberian larutan nutrisi dilakukan menggunakan pompa otomatis berdasarkan hasil pembacaan nilai sensor pH dan TDS. pH, TDS, dan suhu pada perlakuan sistem terkendali berada pada batas optimal sehingga memiliki pertumbuhan sayuran yang lebih bagus dibandingkan dengan sistem tidak terkendali., Aquaponics is a combination of aquaculture and hydroponic farming in one place where fish waste can be utilized as a source of nutrients for vegetables. In an effort to maximize the existing aquaponics development opportunities, it is necessary to apply technology to periodically monitor the water quality conditions of fish ponds that will be flowed into pipes containing vegetables. Making a smart water quality monitoring system can help farmers to control the nutritional needs of vegetables in aquaponic cultivation where the results of monitoring and control can be done through the website. In this study, tilapia and pakcoy were chosen because both have the need for suitable environmental conditions. The measurement time was carried out for 30 days at 07:30 and 17:30. The provision of nutrient solution is carried out using an automatic pump based on the reading of the pH and TDS sensor values. pH, TDS, and temperature in the sistem terkendali treatment are at the optimal limit so that they have better vegetable growth compared to manual control.
Keyword: tilapia, Nutrition, pakcoy, manual control, smart system

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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