Judul: Pemodelan Biplot pada Klasifikasi Data Metagenom dengan Kmers sebagai Ekstraksi Ciri dan LVQ sebagai Classifier
Abstrak: The reading of the genome one organism that it had become is used for the majority of the scientists, now the scientists turn to recitation metagenom , that is the reading of a sample of the genome taken some of the neighborhood. But in reading the fragment metagenom can happen the mixture of fragments of organisms A with B organism caused the same set of overlap between the two. This can be corrected with an binning process, with the purpose to classify fragments into different taxonomy levels. This can be corrected with an binning process, with the purpose to classify fragments into different taxonomic levels. Accuracy results obtained using methods lvq ranges 78.10 % to 90.90 %.Accuracy is 90.90 %, most high namely on trial with those organisms that have long been known and not use 10000 fragments bp biplot.Accuracy results obtained without using biplot larger than the value of accuracy that uses biplot because biplot done reduction finite-dimensional ± 80 % of features.
Keyword: Bogor Agricultural University (IPB), LVQ, biplot, k-mers, metagenom

Judul: Metagenome Classification Using Naïve Bayes Classifier Method.
Abstrak: Metagenome study is an important step in the taxonomic grouping. Grouping can be conducted using binning method. Binning is required to determine contigs of each phylogenetic species groups. In this study, binning is done using supervised learning based composition approach. We used NaïveBayes Classifier method for performing supervised learning and employed counting of k-mer frequencies for extracting feature. The classification process was conducted at genus-level taxon. The results showed that using short fragments (400 bp), our method could obtain the accuracy of 49.34 % and 53.95 % with features of 3-mers dan 4-mers frequencies, respectively. Meanwhile, the accuracy of our method was significally increased when classifying long fragments (10 kbp). Our method could obtain the accuracy of 82.23% with 3-mers frequencies feature and 85.89% with 4-mers frequencies feature. It can be concluded that the accuracy of our classifier was increased by increasing the size of fragments. Moreover, in this research, the 4- mers frequencies feature gave the best results for classifying metagenome fragments.
Keyword: metagenome, k-mers, Naïve Bayes Classifier, binning

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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