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"ABSTRAKPerkembangan berita online di Indonesia saat ini sudah semakin meningkat sehingga kebutuhan dalam melakukan analisis data berita sangat diperlukan untuk mendapatkan intisari informasi yang akurat dan cepat. Topik merupakan komponen dasar yang sering digunakan untuk menganalisis data dalam bentuk teks seperti berita. Dengan menggunakan pemodelan topik, dapat dilakukan pendeteksian topik secara otomatis pada koleksi dokumen berita yang sangat besar dan sulit dilakukan secara manual oleh manusia. Salah satu pemodelan topik yang dapat digunakan adalah metode clustering menggunakan Eigenspace Based Fuzzy C-Means (EFCM). Metode EFCM pada umumnya menggunakan inisialisasi random. Pada penelitian ini akan diimplementasikan metode inisialisasi menggunakan Non-Negative Double Singular Value Decomposition (NNDSVD) dan Fuzzy C-Means++ (FCM++) sebagai alternatif metode inisialisasi pada algoritma EFCM. Hasil simulasi menggunakan inisialisasi NNDSVD dan FCM++ menunjukkan nilai akurasi yang lebih baik dalam hal tingkat interpretabilitas topik daripada metode random.

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ABSTRACT

The rapid increasing of online news in Indonesia creates the need for news analysis to obtain information as fast as possible. Topics are basic components that are often used to analyze data in the textual forms, such as the news article. By using topic modeling, topics can be detected automatically on large news documents which are difficult to perform manually. One of the topic modeling that can be used is the clustering-based method, i.e., Eigenspace-based Fuzzy C-Means (EFCM). The common initialization method of EFCM is random. In this research, Non-Negative Double Singular Value Decomposition (NNDSVD) and Fuzzy C-Means++ (FCM++) will be used as initialization methods of EFCM. The simulations show that the NNDSVD and FCM++ methods gives better accuracies in term of interpretability score than the random method."

"Cylindrical uranium dioxide pellets, which are the main components for nuclear fuel elements in light water reactors, should have a high density profile, a uniform shape, and a minimum standard quality for their safe use as a reactor fuel component. The quality of green pellets is conventionally monitored by laboratory measurement of the physical pellet characteristics; however, this conventional classification method shows some drawbacks, such as difficult usage, low accuracy, and high time consumption. In addition, the method does not address the non-linearity and complexity of the relationship between pellet quality variables and pellet quality. This paper presents the development and application of a modified Radial Basis Function neural network (RBF NN) as an automatic classification system for green pellet quality. The weight initialization of the neural networks in this modified RBF NN is calculated through an orthogonal least squared method, and in conjunction with the use of a sigmoid activation function on its output neurons. Experimental data confirm that the developed modified RBF NN shows higher recognition capability when compared with that of the conventional RBF NNs. Further experimental results show that optimizing the quality classification problem space through eigen decomposition method provides a higher recognition rate with up to 98% accuracy."

"Cylindrical uranium dioxide pellets, which are the main components for nuclear fuel elements in light water reactors, should have a high density profile, a uniform shape, and a minimum standard quality for their safe use as a reactor fuel component. The quality of green pellets is conventionally monitored by laboratory measurement of the physical pellet characteristics; however, this conventional classification method shows some drawbacks, such as difficult usage, low accuracy, and high time consumption. In addition, the method does not address the non-linearity and complexity of the relationship between pellet quality variables and pellet quality. This paper presents the development and application of a modified Radial Basis Function neural network (RBF NN) as an automatic classification system for green pellet quality. The weight initialization of the neural networks in this modified RBF NN is calculated through an orthogonal least squared method, and in conjunction with the use of a sigmoid activation function on its output neurons. Experimental data confirm that the developed modified RBF NN shows higher recognition capability when compared with that of the conventional RBF NNs. Further experimental results show that optimizing the quality classification problem space through eigen decomposition method provides a higher recognition rate with up to 98% accuracy."