Judul: Pertumbuhan dan kelangsungan hidup benih ikan Sinodontis Synodontis eupterus pada kepadatan yang berbeda
Abstrak: In a good environmental condition and adequate quantity of food, an increase of stocking density will increase yield. This experiment was aimed to obtain information about the most optimum stocking density of sinodontis nursery culture. The initial size of sinodontis fry was 2,54+0,11 cm in length and 2,97+0,43 g in weight, which was obtained from a sinodontis farmer at Pagelaran, Bogor, West Java. Prior to experiment, the fry was adapted in the aquaria with a size of 60x29x33 cm which had been filled with 20 ℓ of water. The fry was then cultured at 3 different stocking density treatments. 3, 6, 9 fry/ℓ with 3 replications for a period of 40 days. The fry fed a Limnodrilus sp. twice a day at satiation. Substitution of water exchanged twice a day in the morning and on the afternoon with a rate of 2x30% a day. The result indicated that stocking density did not significantly affected fish survival, specific grow rate, growth of absolute length and coefficient of variation (p>0.05). But when viewed from the economic efficiency, density of 9 fry/ℓ give the best results with the R/C ratio is greatest.
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Judul: Produksi dan Analisis Usaha Pendederan Ikan Sinodontis Ukuran 1 inci dengan Padat Tebar Berbeda
Abstrak: The research aimed to determine optimal stocking density of Synodontis eupterus at body length of 1 inch reared in aquarium. The treatment in this research was three levels of fish stocking density namely 15, 18, and 21 fishes/liter, and water exchange of 100% a day. A control treatment was stocking density of 15 fishes/liter and 60% water exchange a day. The body length mean of fishes used was 2.55 ± 0.03cm. The fishes reared in 25x25x25cm3 aquarium filled with 8L of fresh water, for 40 days. The fishes were fed with bloodworm in the morning and afternoon. The results showed that difference in treatment was not followed by the differences in survival rate. On the 15 fishes/liter density, a 50% water exchanges could increase the growth, compared to the control. However, increasing the stocking density followed by decreasing of the specific growth rate, daily weight growth, the absolute length growth and feed efficiency. In terms of economic aspect, the 21 fishes/liter stocking density was the highest profit value.
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Judul: Deteksi Malware Berbasis System Call dengan Klasifikasi Support Vector Machine pada Android
Abstrak: Android is an operating system that is widely used in smartphone. The biggest threat in Android is the spread of malware that comes from Android application stores. Generally, malware use signature-based method which can be easily avoided by malware that has polymorphic capabilities. Thus, it requires more dynamic detection method. The purpose of this research is to see whether system calls can be used as features to detect Android malware and to test the accuracy of the Support Vector Machine (SVM) in classifying malware and non-malware applications using system call frequencies. The frequencies of system calls were obtained from the result of executing Android applications and unused system calls were excluded. After that, the Principal Component Analysis process was conducted to reduce the dimension and eliminate the irrelevant features. The use of Radial Basis Function kernel in SVM achieves 86.25% of malware classification while the polynomial kernel achieves 90% of malware classification.
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