Judul: Implementasi hidden markov model untuk aplikasi pengenalan ucapan sebagai kendali gerak robot mobil
Abstrak: Robot is an electronic or mechanical equipment capable of performing a series of actions automatically. In the world of robotics, control systems is a very important part that serves to control the movement or navigation in a robot. Sound based mobile control system is an alternative voice control that is quite efficient. However, voice recognition process is not easily done by a machine. It needs a machine learning method that can be used to perform the voice feature extraction by studying the characteristics of a previous vote. This study uses Mel-Frequency Cepstral Coefficient (MFCC) to extract speech signal and HMM (Hidden Markov Model) for modeling the speech signal. Result of the experiment from the whole system performance speech recognition is 96,4% for people that have been inputted in the database, and 91,2% for people which have not been inputted in database. The mobile robot system test results showed that the system has worked well and has an average response time to move after the speech recognition process around 0,46 seconds.
Keyword: 

Judul: Pengenalan Kata Berbahasa Indonesia dengan Hidden  Markov Model (HMM) menggunakan Algoritme Baum-  Welch
Abstrak: Pengenalan suara atau Speech Recognition adalah proses konversi sebuah sinyal akustik, yang berasal dari mikropon atau telepon, menjadi satu atau sekumpulan kata. Sinyal suara sendiri merupakan gelombang yang tercipta dari tekanan udara yang berasal dari paru-paru yang berjalan melewati lintasan suara menuju mulut dan rongga hidung, sehingga memiliki frekuensi yang berbeda. Agar sistem komputer dapat mengenali sebuah kata, maka dibutuhkan representasi yang tepat terhadap sinyal-sinyal yang masuk berikut perubahan frekuensinya dalam rentang waktu tertentu. Penelitian ini menggunakan Algoritme Baum-Welch dalam melatih HMM sebagai model kata. Adapun tujuan penelitian ini ialah menerapkan HMM menggunakan algoritme Baumwelch untuk mengenali sebuah kata. Kata yang digunakan terbatas pada 40 buah kata berbahasa Indonesia yang dibedakan ke dalam 2 macam jumlah suku kata, yaitu : 2 suku kata dan 3 suku kata. Pembicara pada penelitian ini juga dibatasi pada 2 orang pembicara perempuan dan 2 orang pembicara laki-laki yang telah terlatih sebelumnya.
Keyword: 

Judul: Mercury Toxicity and It’s Effect on Histopathology Change of Nile Tilapia (Oreochromis niloticus).
Abstrak: Nile tilapia (Oreochromis niloticus) is one of fish species that oportunity to contaminated with mercury. The effects of pollutants can damage living organisms organs and can cause death. The effects caused mercury had acute or chronic character. The aims of this study are to determine threshold and acute toxicity of mercury chloride (HgCl2) of Nile tilapia (Oreochromis niloticus), to assess the effect of mercury chloride (HgCl2) on several biometric parameters (survival, growth rate of average daily weighted, liver condition, bile and reproductive variability of Nile tilapia (Oreochromis niloticus), assess the level of damage to the histological structure of the gills, liver and kidney of Nile tilapia (Oreochromis niloticus) caused mercury chloride (HgCl2) exposure. This study was conducted from February to June 2013. Nile Tilapia (Oreochromis niloticus) were used in this study were female with average weight 20 grams or 11-13 cm length range. Toxicant materials used in this study was mercury chloride (HgCl2). Fish were reared in each aquarium 60x40x30 containing 48 liters of water. This study consists of three stages: a preliminary test, acute test, and sub-chronic test. To determine the changes in biometric condition of tilapia approximated by measuring the survival rate (SR), the growth rate of average daily weight , the content of mercury in the fish organs, hepatosomatic index (HSI), the relative bile volume (VER), gonadal soamtic index (IKG), fecundity and oocit diameter, tissue damage caused by mercury in fish organs by making histological preparations stained with hematoxylin and eosin. The median lethal concentration (96 hr, LC50) of Mercury Chloride was calculated as 1,64 mgL--1.The survival rate was highest in the control treatment (46,67 %) . Mercury chloride with concentration 0.196 mgL--1 show significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p < 0,05). Mercury chloride with a concentration of 0,164 mgL-1 and 0,196 mgL-1 have not a significant effect on the growth rate of weight, gonadal somatic index and fecundity of Nile tilapia (p > 0,05). Mercury chloride cause damage to gills (hyperplasia, hypertrophy, proliferation and neukrosis), liver (hyperplasia, hemorhage, shrinkage of hepatocytes, proliferation and neukrosis) and kidney (hyperplasia, hemorrhage, shrinkage of the glomerulus, proliferation and neukrosis).
Keyword: Nile tilapia, Hepatosomatic indexs (HSI), histopathology