Judul: Implementasi Question Answering System pada Dokumen Bahasa Indonesia Menggunakan Metode N-Gram
Abstrak: Recent development on Question Answering System (QAS) can accommodate language modeling mechanism for generating a better result. To develop the system, we use Indri Framework toolkit in order to obtain robust document structure and text passages. Documents relevant to a question are first retrieved. The relevant documents are then divided into passages of 2 sentences each. In order to obtain candidate of answers, n-gram weighting is performed in the passage which is contained on the top document. The answer is identified based on matching annotations between the query and the document. One thousand documents and 40 queries are used in the experiment. The result of the experiment indicates 60% of correctness for who questions, 30% of correctness for how much/many questions, 90% of correctness for where question and 80% of correctness for when questions. Our results shows that we need to find ways to improve the effectiveness in finding correct answers, in particular, ways of reducing the number incorrect word tagging.
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Judul: Question Answering System Menggunakan N-Gram Term Weight Model
Abstrak: Currently, search engine has been widely developed having question query feature known as the query answering system. The information provided by the system must fit a specific user requirement. This research will apply the passage selection method using n-gram term weighting model. The evaluation of the method is measured based on the set of questions and documents, and the accuracy for each answer. One thousand documents and 40 queries are used in this research. The result of the research indicates the accuracy for WHO questions is 90%, for WHEN questions is 80%, for WHERE questions is 80%, and for HOW MUCH/MANY questions is 40%.
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Judul: Karakteristik Piezoelektrik Film LaxSr₁-xTiO3 di atas Substrat TCO
Abstrak: Studi material perovskite SrTiO3 sudah banyak dilakukan dan menunjukkan sifat feroelektrik, piezoelektrik, kuantum paraelektrik dan superkonduktor yang baik. Dengan penambahan dopant La2O3 diduga menambah performa sifat piezo dan karakteristik lainnya. Karakteristik film LaxSr₁-xTiO3 (LST) dengan variasi x= 0, 0.02, 0.04, 0.06 terbentuk pada suhu annealing 550 oC di atas substrat TCO melalui metode (Chemical Solution Deposition) CSD dan spin coating dengan 700 rpm pada kondisi suhu ruang dan tekanan atmosfer standar. Hasil menunjukkan, semakin banyak pendadah La maka nilai ketebalan film, ukuran rerata kristalit, parameter kisi, transmitansi, nilai konduktivitas (maksimum 589.7 S/cm pada sampel x=0.04 di frekuensi 10 Hz), nilai konstanta tegangan (c) dan muatan (d) piezo semakin meningkat. Dinamika bentuk grafik nilai tegangan (V) dan konstanta regangan mekanik (s) nampak mirip. Nilai V mencapai 0.127 V untuk x=0.06 (beban 50 g). Nilai maksimum c, d, s masing-masing mencapai 20.07 Vm/N, 1.14x10-8 C/N, 13642.71. Nilai band gap untuk x=0, 0.02, 0.04, 0.06 masing-masing 3.21 eV, 3.1 eV, 2.6 eV, 2.4 eV. La2O3 menambah performa sifat piezo, sehingga LST berpotensi sebagai sensor tekanan.
Keyword: CSD method, La2O3, LaxSr1-xTiO3, piezoelectric, TCO