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: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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