Judul: Pengenalan Sidik Jari Menggunakan Resilient Backpropagation Neural  Network dengan Praproses Transformasi Wavelet
Abstrak: Sistem pengenalan biometrik menggunakan karakteristik fisiologis yang dimiliki manusia sebagai dasar dari pengenalannya. Karakteristik fisiologis yang digunakan harus bersifat unik, permanen, dan universal. Sidik jari memiliki semua karakteristik tersebut sehingga digunakan sebagai dasar pengenalan dalam penelitian ini. Data yang digunakan pada penelitian ini berjumlah 70 buah sidik jari yang diperoleh dari situs internet pada alamat http://www.bias.csr.unibo.it/fvc2000/databases.asp. Sidik jari tersebut diambil dari 10 orang berbeda dengan 7 posisi pengambilan yang serupa. Data akan mengalami transformasi wavelet sebanyak enam level dengan menerapkan bank filter wavelet. Induk wavelet yang digunakan pada penelitian ini adalah Haar. Citra yang akan digunakan pada proses pengenalan sidik jari adalah citra pendekatan hasil dekomposisi wavelet level 1, level 2, level 3, level 4, level 5, dan level 6.
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Judul: Pengenalan iris mata dengan Backpropagation Neural Network menggunakan praproses transformasi wavelet
Abstrak: Biometric system provides automatic identification of an individual based on a unique feature or characteristic possessed by the individual. Data used for this research are obtained from CASIA dataset consisting of 600 eye images from 30 people with 10 left eye images and 10 right eye images from each person. The data are divided into two categories, training data (360 images) and testing data (240 images). Each image contains eyelid, eyelash, sclera, iris, and pupil. The system uses an automatic segmentation based on a threshold to localize the iris collarette. A rubber sheet model is then used to normalize the image into a 20×240 matrix. Feature extraction is conducted using Haar wavelet transformation at level 0 (original image), level 1, level 2, level 3, and level 4. The features are fed into a backpropagation neural network for classification. Parameters observed in this research are number of hidden neurons, learning rate, and momentum at each level wavelet decomposition. Maximum generalization and training time are used as the performance metrics. The best parameters obtained at each level wavelet decomposition are used in testing using 5-fold cross validation. The best recognition of testing data considering the maximum generalization and the training time was obtained from wavelet decomposition level 3.
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Judul: Growth, Concentration Chlorophyll-a, and Structure of Macroalgae Gracilaria edulis in the Culture Media Containing Copper
Abstrak: The physiological responses (specific growth rate, concentration of chlorophyll-a, morphological and anatomical structure of the vegetative cells) of the marine macroalga Gracilaria edulis at the different concentrations of copper (0.01 as control, 0.04, 0.06 and 0,5 ppm) delivered continuously for 28 days under controlled laboratory conditions were investigated. Result showed that the degree of copper toxicity depends on both factor the concentration and exposure time. Copper concentration and day of exposure decreased significantly the specific growth rate (SGR) of the Gracilaria edulis but only 0,5 ppm Cu decreased the chlorophyll-a content when compared to control. Of the various physiological end points measured, growth proved to be the most sensitive response than chlorophyll-a with reductions in specific growth rate (SGR). The reason for this could be related to a greater sensitivity of the enzymes involved in growth than those related to chlorophyll-a or a greater energy needs to maintain cellular integrity and metabolic processes under sublethal Cu stress. In all cases, the main effect on vegetative cells were structure changes in cortex and subcortex cells, compared to control, macroalgae exposed to copper showed depigmentation and blending in the lateral branches, heavy staining of the cell wall and severe damage of cell membrane, while the mucilage and the cell walls was densely fibrillar, thick and heavily stained, the cortex cell was clearly vacuolated, the presence of endophytic on the cell wall and endophytic spores in the mucilage. The presence vacuoles should be related to a metal immobilization mechanism, minimizing the Cu toxicity for cells. The epiphytic bacteria can act as a biofilter diminishing the availability of Cu for macroalgae accumulation.
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