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: Ekspansi Kueri Menggunakan Kamus Kedokteran pada Sistem Temu Kembali Informasi Berbahasa Indonesia
Abstrak: In information retrieval, a problem that often happens is that users face difficulty in forming queries intended to find relevant information. In addition, different vocabularies are used by authors to write the same topic leading to vocabulary gap. Query expansion is one way to overcome the problem. Query expansion is a process of adding terms or phrases to the original query to improve information retrieval performance. In this study, the term expansion is obtained from the translation of medical dictionary. Furthermore, several expansion terms are selected based on the proximity relationship with the original query. Test results show that the performance of information retrieval with query expansion using a medical dictionary gives an average precision of about 82%, and more than 95% of relevant documents can be retrieved by this system.
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Judul: Enzymatic Fuel Cell (EFC) used carbon-polyaniline nanoparticle composite bioanoda with amobolized Glucose Oxidase (GOD).
Abstrak: Polyaniline nanoparticles is one of the conductive polymer which used as a matrix in the manufacture bioanoda in biofuell cell applications. Polyaniline was synthesized by the interfacial polymerization method interfacial two-phase system of organic solvent or water. Products such as polyaniline precipitate was collected and purified by filtrating. The powder was characterized by SEM for morphology structure analyzing of polyaniline surface porous, the analyzing result of particle size was 60 nm. Characterization of TEM showed the thinnest layer of the sample, the morphologically formed groups or aggregations such as fiber to the size of the average particle diameter of 60-80 nm. The crystallinity of X-ray diffraction results showed partial or semi-crystalline structure of polyaniline with an average crystal size was 10.4 nm. Generally, the diffraction pattern indicates that extends sequence crystallinity of polyaniline nanocrystal structure. FTIR analysis indicated that the sample obtained was a conductive polyaniline forms or emeraldine salt (ES). Polyaniline addition on carbon paste electrode observed in voltammogram curve. The oxidation peak in potential 0,4 and 0,6 V, and the reduction peak was seen at -0,1 and 0,8, although it does not look so sharp. The using of glucose oxidase enzyme in solution is less economical, because the enzyme can not be used repeatedly. For using efficiently of enzymes in analyzing and production process, the enzyme immobilization technique was developed. Immobilization of enzymes were applied to produce electron. Polyaniline (PANI nanoparticles) with nanoscale structures with small particle size which had a large surface area, used as a matrix be able to bind the enzyme free and able to maintain the stability of the catalytic activity of the enzyme better. It can be used as an electrode material for anode reaction process on the EFC. Enzymatic fuel cell is an electrochemical technology converted chemical energy into electricity. The driving force is called enzymatic fuel cells are from glucose oxidase enzyme as a bio-catalyst. It also has a high specificity for glucose substrate. The observation result by lower concentration of glucose (0.25 M) produced higher current (5,05 μA). Increasing of glucose concentration( 0,50 M; 0,75M; 1 M) decresed of current results (2,45 μA; 1,69 μA; 1,35 μA). The same thing happens on observations of potential, with a low glucose concentration (0.25 M) produces a high voltage value of 60.8 mV, but decrease voltage value (20.3 mV; 20.8 mV; 15.4 mV) with increasing concentrations of glucose (0.50 M, 0.75 M, 1 M) The value obtained maximum power density was 0.39 μW/cm2 at low glucose concentrations (0,25 M) with increasing concentrations of glucose (0.50 M, 0.75 M, 1 M) decresed the value of the power density (0.071 μW/cm2, 0.044 μW/cm2, 0.026 μW/cm2). The glucose with lower concentration can produced maximum electrical by current, voltage and power density. The values obtained maximum power density was 0.39 μW/cm2.
Keyword: polyaniline, electroda bioanoda, dan enzymatic fuel cell