Judul: Identifikasi Jenis Aglaonema Menggunakan Probabilistic Neural Network
Abstrak: Aglaonema is an ornamental plant that is quite popular in Indonesia. It is estimated that there are nearly 8000 species Aglaonema in the world both native and hybrid. The many types of Aglaonema in the world causes difficult in identifying some types of Aglaonema. This research attempts to identify the type of Aglaonema based on the image using Probabilistic Neural Network (PNN). The data used in this study have 900 images of leaves, which consists of 30 types of Aglaonema. Each image of Aglaonema that will be identified by the system will first be subjected to two stages, texture feature extraction and colour feature extraction. The texture feature extraction used Local Binary Pattern Variance (LBPV) and Co-occurrence Matrix while the colour feature extraction used Histogram-162 (HSV-162). We perform two type of experiment, one where we uses each feature seperately and another where the two features are combine. For classifier we used Probabilistic Neural Network (PNN). The results indicates that the combination of Co-occurrence Matrix with HSV-162 yield a better accuracy compact two when the feature are used seperately. On the other hand, the combination of Local Binnary Pattern Variance (LBPV) and HSV-162 does not yield an increase in accuracy, however the accuracy on this case is better than the accuracy of the combination between Co-occurrence Matrix and HSV-162. The highest accuracy is obtained in the case of the Local Binnary Pattern Variance (LBPV) and HSV-162 with the value of 55.56%
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Judul: Penggabungan ciri morfologi, tekstur, dan bentuk untuk identifikasi daun menggunakan Probabilistic Neural Network
Abstrak: This research proposes a new system for leaf identification using classifier combination and probabilistic neural network. The features that used for classification are morphology, texture, and shape of leaves. Classifiers combination is used to combine these features. The method to extract texture and shape are co-occurrence matrix and Fourier descriptors, respectively. After feature extraction, the feature is classified using probabilistic neural network. The experiment data consist of thirty species flora from Bogor Botanical Garden, Indonesia. The experiment results show that classification without classifier combination has the accuracy of 79.05%, and using classifier combination the accuracy increased to 83.33%. Hence, the propose system is promising for leaf identification and supporting plant biodiversity in Indonesia..
Keyword: Leaf identification; Probabilistic Neural Network; Classifier combination, Probabilistic Neural Network, Classifier combination, Bogor Agricultural University, Institut Pertanian Bogor, IPB

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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