Judul: Karakteristik Anatomi Tiga Jenis Kayu Eucalyptus Dari Sumatera Utara
Abstrak: Industri Hasil Hutan, Khususnya Industri Pulp Membutuhkan Bahan Baku Kayu Dengan Keseragaman Yang Tinggi. Seleksi Pohon Untuk Program Pemuliaan Genetik Eukaliptus Saat Ini Umumnya Didasarkan Pada Laju Pertumbuhan Dan Bentuk Pohon Serta Basic Density Kayu. Walaupun Demikian, Jenis Dengan Basic Density Yang Sama Dapat Memiliki Perbedaan Karakteristik Anatomi Yang Mempengaruhi Kualitas Produk Akhir. Penelitian Ini Bertujuan Untuk Mengkaji Karakteristik Anatomi, Mengevaluasi Variasi Radialnya, Serta Menganalisis Hubungan Karakteristik Anatomi Dengan Basic Density Pada Tiga Jenis Kayu Eukaliptus (Eucalyptus Grandis, E. Urophylla, Dan E. Pellita) Dari Hutan Tanaman Di Sumatera Utara. Hasil Penelitian Menunjukkan Bahwa Walaupun, Ketiga Jenis Kayu Eukaliptus Memiliki Karakteristik Anatomi Dan Variasi Radial Yang Relatif Serupa, Hubungannya Dengan Basic Density Relatif Berbeda. Basic Density, Diameter Pori, Panjang Serat, Diameter Serat, Tebal Dinding Serat Pada Ketiga Jenis Umumnya Meningkat Seiring Pertambahan Umur Kambium, Sedangkan Frekuensi Pori Dan Diameter Lumen Sel Cenderung Menurun. Korelasi Pearson Mengindikasikan Adanya Keragaman Yang Tinggi Pada Karakteristik Anatomi Dalam Pohon Dan Antar Jenis, Sehingga Diperlukan Seleksi Berdasarkan Karakteristik Anatomi Kayu Untuk Program Pemuliaan Tanaman Jenis Eukaliptus Yang Diteliti.
Keyword: Eukaliptus, Anatomi Kayu, Variasi Radial, korelasi, Basic Density

Judul: Variability and Genetic Parameter Analysis in Eucalyptus grandis Population for Growth and Wood Properties at North Sumatera
Abstrak: Indonesia is the 9th largest pulp producer in the world and is able to supply the world's pulp needs of 3 percent of the world's total capacity. The wood of Eucalyptus grandis used as a raw material for charcoal, firewood, pulp products from wood fiber and wood-working. The increment of wood supply is determinant as guarantee this pulp production and it’s supported by the improvement of genetic materials. In tree improvement activities, estimation of genetic parameters for several traits needs to be carried out before selection activities due the phenotype of a plant is determined by genetic and environmental factors. Plant growth and productivity, wood basic density and pulp yield are important traits to know in order to determine the efficiency of using raw materials in producing pulp. For estimating the wood properties, it requires nondestructive testing to keep the plant growing like its original population. Pulp yield character can be estimated by using an NIR (Near Infrared), while the wood basic density traits can be estimated using a resistograph which calculates the amount of resistance when drilling wood from the bark to the bark of the wood. For wood properties evaluation, preciously modelling is necessary. A population of E. grandis at North Sumatera, Indonesia at 1800 m altitude was analysed for growth and wood properties in this work. Pulp yield (PY) traits were assessed using microNIR and wood basic density (BD) traits using resistoraph. Wood basic density modelling using resistograph was carried out with 315 trees consisting of 158, 139, and 18 trees of Eucalyptus grandis, E. urophylla, and eucalyptus hybrid urograndis. Pulp yield prediction data were analysed with the model developed by PT. Riau Andalan Pulp and Paper Wood Technology Department using microNIR. Wood basic density modelling was analysed with linear regression analysis. Variability and genetic parameter analysis for E. grandis population were carried out with restricted maximum likelihood (REML) and the retraction of genotypes was used best linear unbiased prediction (BLUP) analysis with different selection simulations. The result from wood basic density modelling showed that basic density traits had a variability inside the tree, intra-, and interspecific species. There were found the whole tree’s basic wood density of 379.9 kg/m3 , 400.5 kg/m3 , and 440.6 kg/m3 at 44 months old for E. grandis, hybrid urograndis, and E. urophylla, respectively. The model developed had a good correlation for predicting wood basic density at 1.3 m and whole tree basic density with the coefficient of determination (R2 ) were in a range of 0.56 to 0.74 for 1.3 m wood basic density prediction, 0.66 to 0.79 to predict whole tree wood basic density and 0.65 to 0.76 to predict average wood basic density. Combined data from all species shows the best model with R2 0.74 to 0.79. After modelling the assessment for wood basic density using resistograph and pulp yield using the microNIR was carried out. The variability analysis for growth character showed individual heritability for growth character with Height (HT) and diameter breast height (DBH) traits was 043 and 0.36, for wood properties character (BD and PY) were 0.41
Keyword: Eucalyptus, wood properties, variability, genetic gain

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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