Judul: Design and Build Automatic Nutrient Mixing Control System in Drip Irrigation Purwoceng Plant Cultivation System
Abstrak: Purwoceng merupakan tanaman obat asli Indonesia yang tumbuh secara endemik di Dieng, Jawa Tengah. Purwoceng memiliki senyawa yang digunakan pada industri obat. Produksi purwoceng dipengaruhi oleh parameter lingkungan tumbuhnya. Maka dari itu, dalam rangka pelestarian purwoceng, perlu kajian budidaya purwoceng dalam lingkungan terkontrol sehingga purwoceng dapat dibudidayakan secara optimal dan terlindungi dari kepunahan serta membantu ketersediaan bahan baku obat. Penelitian ini bertujuan untuk membuat sistem controlling parameter nutrisi pada tanaman purwoceng dalam plant factory. Purwoceng ditanam dengan tiga kondisi konsentrasi larutan nutrisi yang berbeda yaitu 1000 ppm, 1500 ppm, dan 2000 ppm. Plant factory mampu mengkondisikan lingkungan sesuai kebutuhan purwoceng dengan suhu udara 15–26 °C dan kelembaban udara 60–75%. Luaran yang diharapkan dari penelitian ini adalah hasil uji coba dan ketelitian sistem kontrol otomatis pencampuran nutrisi di plant factory berupa nilai error untuk setiap nilai electricity conductivity yang telah ditentukan., Purwoceng is a native Indonesian medicinal plant that grows endemic in Dieng, Central Java. Purwoceng has compounds used in the drug industry. Purwoceng production is influenced by the environmental parameters of its growth. Therefore, in the context of preserving purwoceng, it is necessary to study the cultivation of purwoceng in a controlled environment so that purwoceng can be cultivated optimally and protected from extinction and help the availability of medicinal raw materials. This study aims to create a system for controlling the nutritional parameters of the. Purwoceng is planted with three conditions nutrient solution concentrations, namely 1000 ppm, 1500 ppm, and 2000 ppm. The plant factory can be conditioning the environment according to Purwoceng's needs with an air temperature of 15–26 °C and air humidity of 60–75%. The expected output of this research is the results of testing and accuracy of the automatic control system for mixing nutrients in factories, the error value for each predetermined electrical conductivity value.
Keyword: electricity conductivity, irigasi tetes, nutrisi, plant factory, purwoceng

Judul: Design of Purwoceng Plant Growth Monitoring Systems in Mini Plant Factory Based on Machine Vision
Abstrak: Purwoceng adalah tanaman obat yang dikategorikan hampir punah karena langkanya budi daya dan lahan yang sesuai untuk budi daya purwoceng. Upaya pelestarian dan peningkatan tanaman purwoceng dilakukan dengan budi daya di mini plant factory yang menerapkan monitoring pertumbuhan tanaman berbasis machine vision agar pertumbuhan tanaman dapat terpantau dengan baik. Tujuan penelitian ini adalah merancang sebuah sistem pemantauan pertumbuhan tanaman yang mampu memantau perkembangan keragaan tanaman purwoceng dilihat dari parameter total luas daun dan kadar kehijauan daun di mini plant factory berbasis machine vision. Tahapan penelitian ini mengacu pada metode System Development Life Cycle (SDLC) yang terdiri dari investigasi sistem, analisis sistem, desain sistem, implementasi sistem dan pengujian sistem. Program total luas daun pada sistem ini memiliki tingkat error sebesar 42,69% dan setelah dikalibrasi menjadi sebesar 6,82%. Program kadar kehijauan daun diperoleh dari nilai rataan green pada citra daun untuk mengetahui kepekatan kadar warna hijau pada daun. Berdasarkan pemantauan tanaman purwoceng pada 100-112 HSPT melalui data total luas daun dan kadar kehijauan daun, sistem ini terbukti mampu memberikan informasi pertumbuhan tanaman yang tidak normal secara akurat., Purwoceng is a medicinal plant that is categorized as endangered due to the scarcity of cultivation and suitable land for purwoceng. Efforts to preserve and improve purwoceng plants carried out by cultivate them in mini plant factory that implements machine vision-based plant growth monitoring so that purwoceng growth can be monitored properly. The purpose of this research is to design a plant growth monitoring system that can monitor the purwoceng appearance in the from of total leaf area and leaf greenness based on machine vision in mini plant factory. The stages of this research refer to the System Development Life Cycle (SDLC) method that consists of system investigation, system analysis, system design, system implementation and system testing. Total leaf area program in this system has an error rate of 42.69% and after being calibrated it becomes 6.82%. The leaf greenness program is obtained from the average value of green in the leaf image to determine the concentration of green color in the leaves. Based on the monitoring of purwoceng plants at 100-112 HSPT through data on total leaf area and leaf greenness, this system was proven to be able to provide accurate information on abnormal plant growth.
Keyword: leaf greenness, machine vision, monitoring system, purwoceng,, total leaf area

Judul: Pemodelan Harga Saham Menggunakan Model Lévy dan Model Black-Scholes
Abstrak: Stock may produce high profits. However, it has a high risk as well, because the stock prices fluctuate over time. Therefore, a model is required to estimate the future stock prices accurately. In this paper, Lévy model is compared to Black-Scholes model in estimating the stock price at Bank of America Corporation. As a result, it is concluded that the Black-Scholes model is more accurate than Lévy model.
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