Judul: Perbandingan Metode Pengenalan Pola Suara Menggunakan Codebook dan Probabilistic Neural Network Berdasarkan Kisaran Usia dan Jenis Kelamin
Abstrak: Voice signal be used to identify a speaker, including the age range and gender based on the difference of its frequency characteristic. This research compares two method of voice identification namely codebook and probability neural network (PNN) in recognizing the age range and gender of the speaker. In this research, the age range is divided into three categories namely children (8-11 years old), teenagers (12-17 years old) and adults (30-50 years old). Each age category is divided based on gender, so that there are six categories in total. This research utilized 600 voice data representing the total six categories. MFCC is used as a method of feature extraction, whereas K-means is used as the clustering method. Several important parameters in the MFCC process are the number of cepstral coefficients, overlap, and time frame. The overlap and time frame values are 0.5 and 40 ms, respectively; whereas the chosen cepstral coefficients to produce the maximum accuracy are 13, 20, and 26. The comparison of voice identification is constructed from three different proportions of training data and testing data (25%:75%, 50%:50%, 75%:25%). It is shown that the accuracy of codebook method is 97.20% whereas that of PNN is 95.17%.
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Judul: Pengenalan Suara Berdasarkan Usia dan Jenis Kelamin Menggunakan Algoritme Support Vector Machine (SVM)
Abstrak: Voice recognition using computers is made possible due to the unique characteristics and frequencies that each voice possesses. These vocal characteristics can be grouped according to gender (male or female) or age (child, teenager, or adult). The purpose of this research is to identify individual voices that have been placed within one of the groups based on age and gender. The data used comes from the research of Fransiswa (2010) and consists of six classes: boys (AL), girls (AP), teenage boys (RL), teenage girls (RP), men (TL), and women (TP). The method used to extract vocal characteristics was the Mel Frequency Cepstrum Coefficient (MFCC) and pattern recognition was performed using a Support Vector Machine (SVM) with several variations of the kernel such as Linear, Polynomial, and Radial Basis Function (RBF). The parameters affecting the MFCC process include: The value of the coefficients, overlap, time frame, and the rate of sampling. The average highest accuracy value of 98,24% was obtained using the RBF Kernel
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Judul: Extracellular Expression of thermostable Geobacillus stearothermophilus T1.2RQ Lipase for Biodiesel Production
Abstrak: The extracellular expression of enzymes in an excellent secretion host such as Bacillus subtilis is a useful strategy for making enzymes of industrial significance more affordable by lowering the cost of its downstream processing. Lipases are a category of hydrolases that catalyze the hydrolysis of triglycerides to glycerol and free fatty acids. Also, lipases catalyze the hydrolysis and transesterification of other esters as well as the synthesis of esters. They can perform very specific biotransformation reactions and are widely used in food, organic synthesis, detergents, cosmetic, and pharmaceutical industries. Geobacillus stearothermophilus T1.2RQ lipase is an industrially-desired thermostable lipolytic enzyme with an excellent hydrolytic and transesterification activity. This study aimed to express T1.2RQ lipase, in B. subtilis WB800 and ensure its secretion into the extracellular medium. Three signal peptides (AmyQ, Epr, LipA) and two promoters (Pgrac01 and Pgrac100) were used in the secretory-expression of T1.2RQ lipase, based on five constructed expression vectors constructed by restriction cloning and PCR mutagenesis. Sangers sequencing was used to verify constructs to ensure they are in the correct reading frame. Recombinants vectors, pHT43 (plasmid control), pHT43-T1.2RQ, pHT43- T1.2RQ_AmyQ, pHT43-T1.2RQ_Epr, and pHT43-T1.2RQ_LipA, were transformed by electroporation into Bacillus subtilis WB800. The electroporation was successful with the optimum condition of 2500V, 200 ohms, 25µF, and 5milliseconds. Recombinant B. subtilis pHT43 (negative control) and pHT43-T1.2RQlip + signal peptides were streaked on the lipidic agar, LA+TBN. All four recombinants, including the negative control (B. subtilis WB800-pHT43), produced clear zones on the TBN agar plate after overnight incubation (fig 2), indicating the presence of a lipolytic enzyme in all of the recombinant B. subtilis cells. pHT43-T1.2RQlip + signal peptides (AmyQ, Epr, and LipA) have clear zones with significantly higher diameters than B. subtilis WB800-pHT43 (negative control). This phenomenon suggests that the recombinant thermostable lipase T1.2RQ introduced into these cells was successfully expressed, thereby increasing the lipolytic capability of its host cells T1.2RQ lipase was expressed in 50ml terrific broth medium (TB) and the expression induced with 1mM IPTG. Lipase activity assay using p-nitrophenyl esters showed that all three signal peptides directed the secretion of T1.2RQ lipase into the extracellular medium. Signal peptide, LipA, resulted in the highest extracellular activity of 5.6 U/mL, which corresponds to a 6-fold increase over the parent B. subtilis WB800 strain. Meanwhile, signal peptides, AmyQ and Epr produced 4.2 U/mL and 3.4 U/mL activity respectively. SDS-Zymogram analysis confirmed that T1.2RQ lipase was correctly processed and secreted in its original size of 44 kDa. An attempt to further increase lipase expression level by promoter optimization showed that, contrary to expectation, promoter Pgrac100 exhibited similar expression levels as the original Pgrac01. Nevertheless, the demonstration of the successful secretion of T1.2RQ lipase in this work confirms the latter as a promising approach for the industrial production of the enzyme
Keyword: Bacillus subtilis, Expression, Extracellular, Heterologous, Lipase, Thermostable