Judul: Ekspansi Kueri dalam Sistem Temu Kembali Informasi  Berbahasa Indonesia Menggunakan  Peluang Bersyarat
Abstrak: Tujuan penelitian ini adalah mengimplementasikan dan mengevaluasi kinerja dari Automatic Query Expansion (AQE) dengan metode conditional probability dalam sistem temu kembali informasi probabilistic model. Pemilihan dan pembobotan istilah kueri ekspansi menggunakan nilai conditional probability. Pengujian dilakukan dengan memperhatikan term dan jumlah term yang ditambahkan sebagai kueri, kemudian membandingkan hasil nilai rata-rata precision yang dihasilkan pada setiap tingkat recall dengan hasil metode lain yang telah diteliti sebelumnya. Selain itu, dilakukan perbandingan hasil pada setiap pengujian berdasarkan nilai threshold yang digunakan. Jumlah term ekspansi yang diujikan di antaranya addterm 2, addterm 4, addterm 5, addterm 6, addterm 8, dan addterm 10. Jumlah dokumen yang digunakan dalam pengujian sistem ini sebanyak 700 dokumen dengan 30 kueri beserta gugus jawabannya.
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Judul: Ekspansi Kueri pada Sistem Temu Kembali Informasi Berbahasa Indonesia menggunakan Kamus Dwibahasa
Abstrak: The most frequent problem on information retrieval is the users inability in representing information they need, in a query form. Thus, one of the solutions to overcome such situation is by applying query expansion technique. By applying the method, query will be expanded, and the new query produced will be used to do the search task. One of the approaches in determining the term of the expansion is Translation with Bilingualism Dictionary, which works through query translation process using dictionary, and the calculation of weight from each expanded candidate terms. In order to increase the relevance of the search result, this research uses Translation with Bilingualism Dictionary as the method to apply. Acknowledging the influence of the method, the research trial and error through the observation of the eleven recall precision number is applied to the produced retrieval result by using different expansion terms. Based on the observation of the produced precision number, it is identified that the use of Translation method in this research has not been successfull in increasing the relevance of the search results. The more expansion terms used, the smaller the precision number produced.
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Judul: Photosensor producing based on ferroelectric material of Ba0,5Sr0,5TiO3 doped by Ferrium Oxide (Fe2O3) on a P-Type Silicon Substate Si (100) applied as a digital camera with a single pixel image sensor
Abstrak: Thin film Ba0,5Sr0,5TiO3 (BST) doped with Fe2O3 was grown on p-type silicon substrate (100) using chemical solution deposition (CSD). It used the solvent 2-methoxyethanol with annealing temperature of 850°C and the doping treatment Fe2O3 of 2.5, 5, 7.5, 10 % of the mass formed BST. Pure BST had the highest absorption of 600 nm of light wavelength. Additions Fe2O3 moves highest absorption in the range of 560 nm. Fe2O3 addition was strengthening thin film sensitivity to the effects of light. In general, doping Fe2O3 10% was result the best absorbance and current-voltage of BST thin film. Electrical properties of thin films BST include dielectric, photoconductivity, and dissipation energy. Based on the current-voltage (I-V) analysis, pure BST and doped BST showed photodiode properties. Dielectric values obtained in the range from 23.32 to 243. Based on electrical conductivity data and energy dissipation, BST thin films have shown photodiode characteristics and are therefore suitable as light sensors. The image sensor in a digital camera is also a light sensor. This BST thin film has been scientifically proven to be a light sensor and also it can be applied as an image sensor. This is a novelty image sensor based on thin film Ba0.5Sr0.5TiO3.
Keyword: barium strontium titanate, thin film, photodiode, image sensor, digital camera