Judul: Ekspansi Kueri pada Sistem Temu Kembali Informasi Berbahasa Indonesia Menggunakan Thesaurus
Abstrak: Query expansion is a common technique for fixed query in order to yield a better information retrieval result. Using a thesaurus is a way for fixed query. Thesaurus is a dictionary of words and terms which are collected and filtered by correlation of meaning of the word, like synonim, antonim, hyponim, and hypernim. This research is intended to analyze the effectivity of query expansion using thesaurus Global Analysis Method. There are a thousand agricultural documents and 93 medical plants documents. The research used Tf-Idf as a weighting method. The result of system performance which were used in this research is good with average precision of 53% for agricultural document and 76% for medical plants document using thesaurus query expansion. The maximal result that the thesaurus could gain is by using two-word length query. Query expansion method using thesaurus has a better result than the one using 2-language dictionary and pseudo relevance feedback document segmentation. The query length and the taking of some number of word group in thesaurus will affect the result of information retrieval.
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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: Pelapisan Hidroksiapatit (HAp) Pada Permukaan Logam Stainless Steel 316L Dengan Metode Deposisi Elektroforesis (EPD)
Abstrak: Telah dilakukan penelitian Ullluk meiapisi pennukaan logam sfainless steel 316 L. oleh material hidroksiapatit dengan rnetode deposisi elektroforesis. Hidrokiapatit dibuat dengan Illctode presipitasi, dari hasil kalsinasi cangkang telur pada suhu JOaOoe selama 5 jam dan (NH4hHP04 . Pemilihan logam stainless steel (S8) didasarkan pada sifat ketahanan korosi yang baik, kadar illlpuritas rendah, dan mudah dibentuk. Penelitian dilakukan dengan rnelarutkan hidroksiapatit pada etanol ditambah trietanolamin sebagai dispersan. Konsentrasi Cal P yang digunakall pada saat presipitasi yaitu 0,3/0,16, Spektra infra merah menunjukkan bilangnya karbonat pada sam pel hasil presipitasi yang dipanaskan pad a suhu 900°C. Pola difraksi sinar X untuk hasil presipita:;i yang c1ipanaskan pad a suhu 900°C, menunjukkan fasa yang terbentuk adalah hidroksiapatit. Pola dilj'aksi setelab coaling menul1ujukkan adanya fasa hidroksiapatit dan base metal yaitu logam SS. HasH uji mikrostruktur menlll~ukkan, diantara penggunaan variabel tegangan 30 V; 60 V dan 90 V selama 1,2, dan 3 menil pada saat coating, penggunaan variabel tegangan 60 V selama 2 menit, menunjukkan hasil peJapisan yang paling merata pada pennukaan logam SS. Sintering dengan suhu sooDe lebih menguatkan peJapisan hidroksiapatit pada permukaan logam dibandingkan dengan sintering pacta suhu 250°C.
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