Judul: Identification of Affecting Factors on the GPA of First Year Students at Bogor Agricultural University Using Random Forest
Abstrak: Academically, the success of a student can be demonstrated by Grade Point Average (GPA). The performance of a student can be seen from the academic achievements, potential and motivation from themselves. Success in obtaining a high GPA can not be separated from the factors that affect the intellectual factor (the score of final examination in high school) and non-intellectual factors (gender, enrollment scheme to university, age when enrolled to university, senior high school status, etc). The data used for this research is the secondary data obtained from Student Affairs Directorate Bogor Agricultural University. Random forest method is an ensemble classifier using many decisions tree models. It can be used for classification or regression. This research is aimed to determine the size of the random forest and sample size of the explanatory variables that produces random forest with high prediction accuracy and stability that can identify the most important influential factors in student's academic achievements (GPA). High accuracy and stability can be obtained if size of the explanatory variable (m) and the size of the random forest (k) is determined by the right value. The values of m used in this study are 3, 4, 5 and 6. The values of k used in this study are 100, 500 and 1000. The smallest misclassification rate is at m = 4 and k = 100 with misclassification rate is 39.36%. Optimum random forest trees is used to get the best identifier variables. The most influential variable of the GPA of student at Bogor Agricultural University in the first year study by ranking criteria used Mean Decrease Gini (MDG) value of random forest.
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Judul: Evaluasi Karakteristik IPK Mahasiswa Penerima Beasiswa PPA dan BBM dengan Pohon Regresi (Studi Kasus di Program Sarjana Institut Pertanian Bogor Tahun 2012/2013)
Abstrak: Improving Academic Achievement (PPA) scholarship is intended for students who have high achievements, while Student Learning Assistance (BBM) scholarship is intended for students whose parents are less capable and have good achievement. Achievements can be measured using the Grade Point Average (GPA). Therefore, to determine the characteristics of the student who receive scholarship done by classification methods based on GPA. The data which being used are online PPA and BBM extension questionnaire. Explanatory variables were analyzed by 20 variables with the response variable is student’s final GPA. The method for this classification is CART (Classification and Regression Trees) with a regression tree. The regression tree of PPA scholarship recipent produces four terminal nodes with an average GPA at initial node is 3.413, the most effective variable in the of partition the node are students father’s occupation, income per capita per month and students income per month. BBM scholarship produces six terminal nodes with an average of GPA for the initial node was 3.014, the explanatory variable that used for partioning were insulating the income per capita per month, child’s, father’s education, father’s occupation, and region of origin.
Keyword: CART, PPA and BBM scholarship, regression tree

Judul: Desain Sistem Transfer Energi Nirkabel Berbasiskan Tesla Coil
Abstrak: Tesla coil merupakan alat yang ditemukan oleh Nikola Tesla yang dapat mentransmisikan daya tanpa kabel dengan memanfaatkan prinsip induksi elektromagnetik. Pada penelitian ini dibuat sebuah prototype Tesla Coil dengan menggunakan transistor C1970 dan receiver menggunakan rangkaian LC. Identifikasi alat meliputi pengaruh daya input transmitter terhadap receiver, bentuk signal yang dipancarkan transmitter, pengaruh jarak transmitter dan receiver, nilai efisiensi serta efek alat terhadap perangkat lain. Hasil pengamatan menunjukkan bahwa semakin besar daya input maka semakin besar daya yang dipancarkan oleh transmitter. Bentuk sinyal yang dipancarkan oleh transmitter berupa gelombang listrik AC sinusoidal dengan frekuensi ~2.9 MHz. Semakin jauh jarak receiver terhadap transmitter maka semakin kecil amplitudo gelombang AC yang diterima oleh receiver, menyebabkan semakin kecil daya yang diterima oleh receiver. Adapun nilai efisiensi terbesar penangkapan daya oleh receiver yaitu sebesar 0.00516 % serta terdapat gangguan pada alat-alat tertentu seperti monitor komputer dan radio.
Keyword: rangkaian LC, receiver, tesla coil, transistor C1970, transmitter