Judul: Ukuran Kemiripan Sweetspot Similarity Pada Temu Kembali Informasi Anotasi Gene Ontology Berbasis Solr
Abstrak: Biodiversitas Informatik adalah sebuah upaya membuat sumber informasi keanekaragaman hayati dalam format digital. Biodiversitas informatik menggunakan struktur ontologi dalam memetakan pengetahuannya. Gene Ontology (GO) adalah sebuah ontologi di bidang biologi molekular yang dikembangkan oleh Gene Ontology Consortium. Gene Ontology memiliki 3 komponen, yaitu molecular function, biological process, dan cellular component. Dibutuhkan mesin pencari yang relevan serta mampu mengolah data biodiversitas yang besar. Apache SOLR merupakan mesin pencari yang dibangun pada Apache Lucene. Uji kemiripan pada SOLR Sweetspot similarity dapat mengantisipasi masalah perbedaan panjang anotasi GO dengan melakukan normalisasi panjang dokumen. Normalisasi panjang dokumen ditentukan berdasarkan perbandingan dari beberapa parameter dan didapatkan nilai min 51, max 100, dan steepness 0.4 sebagai acuan yang terbaik. Hasil dari penelitian ini menunjukkan nilai Mean Average Precision dan RPrecision sweetspot similarity lebih baik dibandingkan dengan classic similarity.
Keyword: Apache SOLR, Biodiversitas Informatic, Gene Ontology, Mesin pencari, Sweetspot Similarity

Judul: Ukuran Kemiripan Gene Ontology Annotation Berbasis Language Model Dirichlet Similarity Menggunakan Solr
Abstrak: Informasi mengenai keanekaragaman hayati khususnya gen tumbuhan banyak ditemukan dari buku-buku terkait ataupun dari internet. Tetapi informasi ini sangatlah besar dan memiliki format yang berbeda-beda. Biodiversity Informatics dapat menutupi kekurangan ini dengan menggunakan struktur ontologi sebagai representasi pengetahuannya. Gene Ontology (GO) merupakan ontologi yang menyediakan informasi mengenai gen. Dalam penelitian ini digunakan sebuah mesin pencari Apache Solr untuk mencari data dengan skala besar seperti GO. Urutan ranking dokumen yang dikembalikan ditentukan dengan melihat kemiripan language model dengan dokumen yang telah dilakukan smoothing dengan metode Dirichlet Smoothing. Pengaruh salah satu parameter Dirichlet, panjang dokumen, terhadap estimasi peluang tidak terlalu besar. Tingkat relevansi sistem berdasarkan nilai MAP dan R-precision sudah cukup relevan. Hasil penelitian menunjukkan bahwa semakin besar panjang dokumennya maka akan semakin kecil pengaruh Dirichlet prior terhadap estimasi peluang.
Keyword: biodiversity informatics, gen tumbuhan, ontologi, temu kembali informasi

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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