Judul: Pengenalan Pembicara Dengan Mel Frequency Cepstrum Coefficient (MFCC)     Sebagai Metode Ekstraksi Ciri Dan Jaringan Saraf Tiruan Propagasi Balik Sebagai     Metode Pengenalan Pola
Abstrak: Suara yang dimiliki setiap manusia mempunyai ciri khas tersendiri yang dapat dijadikan sebagai alat identifikasi. Identifikasi pembicara atau speaker recognition merupakan salah satu aplikasi dalam ranah Natural Language Processing yang merupakan suatu sistem untuk mengidentifikasi siapa yang berbicara. Penelitian dilakukan dengan merekam suara beberapa orang. Kemudian suara diolah dengan tahapan silence Elimination, dilanjutkan dengan ekstraksi ciri dengan metode Mel Frekuensi Cepstrum Coefisien (MFCC). Pemodelan menggunakan Back Propagation Neural Networks sebagai metode pengenalan pola. Dari penelitian yang telah dilakukan dapat disimpulkan bahwa Pemodelan penggunaan Back Propagation Neural Networks pada pengenalan speaker mempunyai akurasi sebesar 94,02% lebih baik dibandingkan dengan penggunaan Resilient Backpropagation sebesar 92,8% pada penelitian sebelumnya. Akurasi terbaik Back Propagation Neural Networks dengan 50 lapisan tersembunyi, perbandingan data test dan data train 60:40, dan overlap 40%. Pengujian dengan penambahan noise 30dB pada pengujian data akurasi meannya adalah 92,27%, noise 20dB pada data dengan akurasi rata-rata 73,55%, noise 10dB pada data dengan akurasi rata-rata 24% dan pada data dengan noise Akurasi rata-rata 5dB adalah 13,31%.
Keyword: Backpropagation ANN, back propagation ANN, MFCC, Speaker Recognition

Judul: Speaker Identification System Modeling Using MFCC as Feature Extraction and SVM as Pattern Recognition
Abstrak: Everyday people exchange information using voice may also exchange information with the media texts and tools. Voice signal every human has the character and qualities of different or unique. Indonesia has a diverse ethnic, communities and cultures, many problems are for the same word has different pronunciation patterns. Because of this problem could be a problem in the speaker identification system, so it is necessary to develop a system that is relatively more robust to the problem of intra-speaker variability and noise. Speaker identification system is more focused on the analysis of the two subsystems, namely Feature Extractor and Pattern Recogniser. Mel-Frequency Cepstrum Coefficients (MFCC) is one of feature extraction that is often used for processing the human voice for calculating the cepstral coefficients with the consideration of human hearing. Support Vector Machine (SVM) is one of the classification techniques of data with the supervised learning that is able to classify the multi-class so it is suitable for the classification of more than two classes. Data collection was performed using a microphone to record sound. Sound source was obtained from 10 adult speakers with differences in gender, age and ethnicity, which each speakers say 50 times the word "COMPUTER" so that obtained 500 data. Record duration is 2 seconds with a frequency of 16 KHz. Before data is processed, a preprocessing stage consisting of the elimination of silence, normalization and noise addition. Gaussian noise is added from the level of 80 dB to 0 dB. After the MFCC feature extraction is done, the next stage is SVM pattern recognition using QP and SMO algorithms. Kernel function tested for RBF, Linear, and Quadratic for each algorithm. Pattern Recognition using Kernel quadratic function with a ratio of 90 : 10 for the test data that the original sound without noise, SMO algorithm produces accuracy of 97.0% and the accuracy of the system can maintain above 70% up to 40dB noise addition. The number of errors for all 10 speakers using the test data of the original sound without noise is at most the number 9 speakers (Male, 41 years old, Java). The processing time SMO algorithm is better than the QP algorithm. Future studies may be added to increase the accuracy of Noise Cancelling the voice data is contaminated by noise.
Keyword: Speaker Identification, MFCC, SVM

Judul: Toksisitas logam berat Cu pada berbagai pH terhadap konsumsi oksigen dan respon hematologi ikan nila gift (Oreochromis sp)
Abstrak: Copper is one of the essential element useful for metabolism of aquatic organisms. Its usually used to control growth of algae and pathogenic bacteria in aquatic environment, but it can be toxic if in large quantities. The pH value is very influential on copper specification in water. The aim of this research was to analyse the toxicity of copper element at various pH on oxygen consumption and haematology responses of nile tilapia. This results can be used as information for aquaculturists and the society at large on copper toxicity incase of change in the water pH value. The results of this research indicates that significant difference in all the blood parameters (average erythrocyte, leucocyte, Hct, Hb and leucocyte differentiation) between treatments (p<0,05) with preference, decreases with decrease in pH value. Based on filaments histology analysis results indicates that infection on gill filament, kidney and skin hence interferes with the rate of oxygen consumption and abnormality in the blood of specimen. Fish survival rate in the P1 (pH 5±0,5) 46.67% was lower than in other treatments. Accumulation of copper due to decrease in water pH also decreases oxygen consumption rate, as well as blood parameters.
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