Judul: Pemetaan Tingkat Serangan Hama Kutu Kebul (Bemisia tabaci) Berbasis Mobile Android
Abstrak: Dalam proses penanganan serangan hama, tahap monitoring merupakan tahap yang cukup penting. Pada tahap ini dilakukan pemantauan tingkat serangan hama kutu kebul. Informasi serangan hama berguna untuk menentukan metode penanganan hama yang efektif dan pendugaan arah penyebaran hama. Implementasi sistem dilakukan pada lingkungan mobile berbasis android. Penggunaan mobile android dimaksudkan untuk mempercepat pengiriman data dari lapangan. Beberapa teknologi yang mendukung penelitian ini antara lain Google Map dan GPS. Metode yang digunakan dalam penelitian ini adalah perancangan sistem, akusisi data, praproses, segmentasi citra, perhitungan nilai serangan hama untuk satu daun, perhitungan nilai serangan hama untuk satu tanaman, perhitungan nilai serangan hama untuk satu area, dan pemetaan tingkat serangan hama. Data citra yang digunakan pada penelitian ini yaitu 25 citra daun tanaman sayuran. Hasil perhitungan untuk lima area yang disimulasikan menghasilkan akurasi 100%. Hal ini menunjukkan bahwa dalam skala yang besar, kesalahan segmentasi pada beberapa daun tidak terlalu mempengaruhi hasil akhir.
Keyword: Bemisia tabaci, Google Map, Plant mapping, Whitefly, Mapping, Akuisisi data, Image segmentation, Tingkat serangan hama, Pemetaan hama, Metode segitiga

Judul: Segmentasi Citra Menggunakan Metode Segitiga untuk Pengukuran Tingkat Kerapatan Hama Kutu Kebul
Abstrak: Whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), is one of the major important pests of vegetables. Its small size and the insufficient number of pest observers have cause difficulties in monitoring the pests. One solution to overcome this problem is by using digital image processing. With digital image processing techniques, pest density can be measured accurately. In this study, triangle method is used to get the dynamic threshold value to be used in the segmentation process. The Images of vegetable used in this study are 23 images of eggplant leaves. The image will pass through several stages, including preprocessing, image segmentation and density calculations. The result of Image segmentation for 23 images using the triangle method has an accuracy of 75.36%. This suggests that the triangle method can be used for the segmentation process of whitefly pests in vegetable crops leaf image. By using this method, pest density calculation can be done optimally.
Keyword: Bemisia tabaci, triangle method, whitefly

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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