Judul: Metode cruise pada analisis hubungan status gizi mahasiswa IPB dengan faktor sosioekonomi wilayah dan prestasi SMU
Abstrak: CRUISE (Classification Rule with Unbiased Interaction Selection and Estimation) adalah salah satu metode berstruktur pohon non-biner yang tidak berbias dalam pemilihan peubah. Penelitian ini betujuan untuk menerapkan CRUISE sebagai metode pohon klasfikasi non-biner yang relatif baru dan tidak berbias pada analisis hubungan antara status gizi mahasiwa IPB dengan faktor sosioekonomi, wilayah, dan prestasi di SMU. Data penelitian ini diambil dari Panitia Penerima Mahasiswa Baru (PPMB) IPB, serta Klinik Konsultasi Gizi IPB. Data dianalisis menggunakan algoritma CRUISE dengan pemilahan tunggal (metode 1D dan 2D). Data yang dianalisis sebesar 1811 dari total 1914. CRUISE ID menghasilkan pohon 37 node dengan 20 terminal dan salah klasifikasi 0.1474. Sedangkan CRUISE 2D menghasilkan pohon 32 node dengan 18 terminal dan salah klasifikasi 0.1524. Agar pohon yang dihasilkan lebih sederhana dan lebih logis, diperlukan penyeleksian dan penyederhanaan peubah. Setelah disederhanakan, CRUISE ID menghasilkan pohon 23 node dengan 13 terminal dan salah klasifikasi 0.1552. CRUISE 2D menghasilkan pohon 28 node dengan 15 terminal dan salah klasifikasi 0.1563. Setelah peubah bebas disederhanakan, peubah yang paling bisa membedakan status gizi adalah jenis kelamin, daya listrik, nilai rata-rata rapor MIPA (Matematika, Fisika Kimia dan Biologi), dan pendidikan ayah.
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Judul: Penerapan SMOTE pada Metode CRUISE untuk Penentuan Faktor Keberhasilan Studi Mahasiswa BUD
Abstrak: Classification tree is a simple method to determine the factors that influence a response variable whose type is categorical. However, this method has some problems. First, selection bias on explanatory variables (called selection bias ) and bias due to missing value . This problem can be solved by CRUISE (Classification Rule with Unbiased Interaction Selection and Estimation) 2D. Another problem is the imbalance of data, so that observations in the minority class (a class that have less observation’s number) can’t be classified correctly. SMOTE (Synthetic Minority-Over Sampling Technique) with majority under-sampling is a method that can be used to handle those problems. The aim of this study is determining academic success factors of BUD (Beasiswa Unit Daerah) students, which has majority class (‘non-drop out’ category) and minority class (‘drop out’ category). The classification capability of CRUISE 2D tree without SMOTE is very bad, so it’s better to choose the tree from SMOTE with majority under-sampling which use 300 percent of increasing and 133.34 percent of decreasing. This tree has 12 terminals and 5 of them have high risk to be dropped out. Variables that influence the academic result of BUD students are the origin island, the average value of the national exam, the father and mother's education, sponsorship type, parent’s income, and mother’s education. About 73.7% observations with DO class in testing data can be classified correctly by this tree.
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Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
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