Judul: Estimation of nutrient utilization through chemical composition in ruminants forage using artificial neural network (ANN)
Abstrak: hasil produksi ternak ruminansia diperlukan manusi untuk memenuhi kebutuhan pangan. Produktivitas ternak ruminansia ditentukan pakan yang tepat. Pada penelitian ini dilakukan estimasi utilisasi nutrien yang dihasilkan tumbuhan pakan ternak ruminansia berdasarkan kandungan kimianya menggunakan Artificial Neural Network (ANN). Kandungan kimia yang digunakan sebagai pengestimasi adalah kategori main analysis, dan nutrien yang diestimasi adalah kategori ruminant nutritive values.
Keyword: Artificial Neural Network, nutrien, pakan, ruminansia

Judul: Estimasi Nilai Nutrisi Komposisi Kimia Pakan Ternak Ruminansia Menggunakan Metode Bayesian Regularization Neural Network
Abstrak: Perbedaan komponen kimia pakan ternak dapat mempengaruhi nilai nutrisi untuk hewan ternak. Peternak sulit menentukan formulasi pakan yang sesuai dengan kebutuhan hewan ternak untuk mendapatkan nutrisi yang tepat. Estimasi nutrisi pakan ruminansia pada penelitian ini dilakukan berdasarkan komposisi kimia pakan menggunakan metode Bayesian regularization neural network (BRNN). Data yang digunakan dalam penelitian ini didapatkan dari hasil penelitian Rowett Research Institutte (INRA Perancis) pada kategori main constituents dan bagian yang diestimasi adalah ruminant nutritive value . Penelitian ini membuat model BRNN untuk memprediksi nutrisi pakan ternak ruminansia. Proses estimasi dilakukan menggunakan arsitektur BRNN dengan beberapa jumlah neuron hidden layer yang berbeda dan kombinasi jumlah neuron output. Model BRNN dengan 8 neuron ouput merupakan model BRNN terbaik yang memiliki nilai mean absolute percentage error (MAPE) sebesar 11.82.
Keyword: Bayesian regularization neural network, nilai nutrisi, pakan, ruminansia

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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