Judul: Ekstraksi Ciri Dokumen Tumbuhan Obat Menggunakan Chi-Kuadrat dengan Klasifikasi Naive Bayes
Abstrak: This research presented a system for extracting terms and classifying medicinal plants documents using chi-square and naïve bayes classifier. Term extraction technique was used to make the classifier work efficiently and to increase classification accuracy. The criteria used in this research were the family of medicinal plants and utilization of medicinal plants for medication. The classification results were used to build an information retrieval system of Indonesian medicinal plants. This research used two significance levels for generating critical value, i.e 0.001 and 0.01. The experiment result showed that the critical value using significance level of 0.001 has better accuracy than the critical value using significance level 0.01. Accuracy of classification system using significance level of 0.001 were 97.44% for family and 89.74% for utilization of medicinal plants criteria. The information retrieval system tested using 29 queries about family and utilization of medicinal plants. The information retrieval system had an average value generated was 93.26%.
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Judul: Klasifikasi Dokumen Tumbuhan Obat Berbasis Famili Menggunakan Probalistic Neural Network
Abstrak: This research presents a system for the extraction of features and classification of the document medicinal plants using the chi-square method and neural network classification probalistic. Automation family identification by grouping characteristics medicinal plants contained in the document. In this research, the phase consists of collecting documents, doing conversion from hardcopy documents to softcopy into XML format, pre-process the document, featuring selection using the chi-square, document classification using PNN and evaluation using Confusion Matrix. Classification results are influenced by the number of family identifier words. Number of words identifier of a family affected by the same number of words in each document training. The more same words in each document training, the greater probability of the word being said identifier. In this research, identifier of a family does not describe the characteristics of plant taxonomy. This is due to the same number of words in each document has not practically described the characteristics of plant taxonomy. The evaluation research of classification algorithm Probalistic Neural Network (PNN) with weight value 1 and layer patterns using feature extraction using the chi-square values of alpha (α) value of 0.1 overall result of classification is 82.14%. This research represents a medical plant document system that can be used for automatic identification of families according to the taxonomy of plants.This system is useful to help users especially researchers and taxonomists in the identification document through labeling family automatically on each document, with the existing system, therefoe the users dont need to bring a book or a guide book to identify the field. Furthermore, it can overcome the limitations of people's knowledge of the diversity and the use of medicinal plants. That is because there are a lot of documents to train the same word in each document which is not characteristic of plant taxonomy.
Keyword: probalistic neural network classifier, medical plant document, document identification, document classification, chi-square

Judul: Gelombang soliter internal pada lapisan atmosfiri yang memiliki perubahan kecepatan angin yang cepat
Abstrak: Gelombang internal adalah suatu gelombang yang terjadi di dalam suatu fluida. Gelombang ini muncul karena adanya perubahan rapat massa di setiap lapisan di dalam fluida. Salah satu gelombang internal yang ditemui di lappisan atmosfir adalah gelombang soliter internal, seperti yang terjadi pada fenomena "morning glory" di Australia. pada fenomena "Morning glory" terjadi penurunan tekanan hingga bebrapa milibar.
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