Judul: Preliminary Test of Mangosteen Electrical Resistivity Distribution Using Conductive Paper
Abstrak: Manggis merupakan tanaman buah tropika yang memiliki bentuk dan rasa unik, sehingga memiliki nilai ekonomi yang penting sebagai buah ekspor. Manggis memiliki beberapa bagian mulai dari kulit luar, kulit bagian dalam(empulur), daging buah dan biji. Akibatnya, setiap bagian buah manggis memiliki nilai resistansi berbeda pada setiap bagian buahnya. Distribusi resistivitas ini dapat dipetakan sebagai sebuah citra dengan menggunakan metode tomografi resistivitas listrik. Teknik Geolistrik merupakan teknik tomografi resistivitas listrik yang baku dibidang teknologi kebumian. Menggunakan analogi bahwa buah manggis sebagai objek anomali didalam potongan melintang kertas konduktif, dengan salah satu sisi kertas konduktif berfungsi sebagai model analog dari permukaan bumi, sehingga kertas konduktif dianalogikan sebagai potongan melintang bumi. Dengan demikian dapat dilakukan pengukuran sebagaimana halnya perkiraan distribusi resistivitas dari sebagian permukaan kulit manggis. Pengukuran secara manual dilakukan dengan menggunakan pola Wenner dan pola Wenner-Schlumberger sebagaimana halnya survey geolistrik. Dengan menggunakan perangkat lunak RES2DINV, data pengukuran diolah sehingga diperoleh resistivitas lembar kertas konduktif, termasuk perkiraan nilai resistivitas buah manggis. Perkiraan besar resistivitas permukaan sebagian kulit manggis diperkiranan antara rentang 48Ω.m-128Ω.m, Mangosteen is a tropical fruit plant that has a unique shape and taste, so it has important economic value as an export fruit. Mangosteen has several parts ranging from the outer skin, inner skin (pith), flesh and seeds. As a result, each part of the mangosteen fruit has a different resistance value in each part of the fruit. This resistivity distribution can be mapped as an image using the electrical resistivity tomography method. Geoelectrical Engineering is a standard electrical resistivity tomography technique in the field of earth technology. Using the analogy that the mangosteen fruit is an anomalous object in a cross section of conductive paper, with one side of the conductive paper serving as an analog model of the earth's surface, so that the conductive paper is analogous to a cross section of the earth. Thus, measurements can be made as well as an estimate of the resistivity distribution of a portion of the mangosteen rind surface. Manual measurements were carried out using the Wenner pattern and the Wenner-Schlumberger pattern as well as the geoelectric survey. Using the RES2DINV software, the measurement data was processed to obtain the resistivity of a conductive sheet of paper, including an estimate of the resistivity value of the mangosteen fruit. The estimated surface resistivity of some mangosteen rind is in the range of 48Ω.m-128Ω.m
Keyword: Tomografi Listrik, Resistivitas, Prinsip Geolistrik, Kertas konduktif, Manggis

Judul: Pengembangan sistem evaluasi buah manggis secara non destruktif dengan gelombang ultrasonik
Abstrak: Mangosteen remains at the highest value among the exported Indonesian fruits amounting to 9.31 million USD in 2003. However, claim for inner quality remove fruits with low inner quality is often imposed to Indonesian mangosteen. Sortation is critically required to remove fruits with low inner quality such as gamboges, translucent or defect. The objective of this study was to asses the ultrasonic characteristics related to physio-chamical properties of mangosteen for non-destructive evaluation of the fruit.
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Judul: Query Expansion based on Bilingual Dictionary Using Conditional Probability
Abstrak: Query expansion is a technique that can be used to bridge vocabulary gaps between queries and documents in the collection. With query expansion, user will be helped to formulate queries well so that user will optimize the search result. In this study, the expansion term was resulted from the translation of bilingual dictionary. Subsequently, several terms of expansion were elected based on the closeness of its relationship with the original query. This research showed that conditional probability can be used to select expansion term in bilingual translation method query expansion. The result of 1000 documents was more than 97% relevan document can be retrieved by this system. The more expansion term used, the larger number relevan document was retrieved.
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