Judul: Kinerja Produksi Ikan Redfin Epalzeorhynchos frenatus pada Sistem Resirkulasi dengan Padat Tebar Berbeda
Abstrak: Ikan redfin merupakan ikan hias komoditas ekspor yang masih rendah produktivitasnya. Peningkatan produktivitas dapat dilakukan dengan cara meningkatkan padat tebar. Tujuan penelitian ini untuk menentukan padat tebar terbaik ikan redfin berukuran panjang awal rata-rata 1,79±0,01 cm dan bobot awal rata-rata 0,07±0,002 g pada sistem resirkulasi. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 4 perlakuan padat tebar dan 3 ulangan. Ikan dipelihara selama 60 hari di dalam akuarium berukuran 60 cm x 30 cm x 30 cm yang diisi air tawar setinggi 25 cm atau 45 L, dengan padat tebar 5, 10, 15 dan 20 e L-1. Selama pemeliharaan pemberian pakan menggunakan cacing sutera dengan metode ad libitum. Hasil penelitian menunjukkan bahwa kinerja produksi terbaik terjadi pada padat tebar 20 e L-1. Kinerja produksi yang dihasilkan dari perlakuan 20 e L-1 yaitu tingkat kelangsungan hidup 87,78%, laju pertumbuhan spesifik panjang 1,51%, laju pertumbuhan spesifik bobot 3,93%, pertumbuhan mutlak panjang 0,043 cm hari-1, pertumbuhan mutlak bobot 0,01 g hari-1, koefisien keragaman panjang 13,20%, rasio konversi pakan 1,37, serta R/C 3,32 dengan lama pengembalian 0,22 tahun.
Keyword: Epalzeorhynchos frenatus, ikan redfin, kinerja produksi, padat tebar, sistem resirkulasi

Judul: Pertumbuhan dan kelangsungan hidup benih ikan redfin Epalzeorhynchos frenatum 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 redfin nursery culture. The initial size of redfin fry was 2.22±0.21 cm in length and 0.11±0.06 g in weight, which was obtained from a redfin farmer at Pagelaran, Dramaga, Bogor, West Java. Prior to experiment, the fry was adapted in the aquaria with a size of 30x20x20 cm3 which had been filled with 5 ℓ of water. The fry was then cultured at 4 different stocking density treatments. 2, 3, 4, 5 fry/ℓ with 3 replications for a period of 30 days. The fry was fed by Oligochaeta twice a day at satiation. Culture water was exchanged twice a day in the morning and on the afternoon with a rate depended on the stocking density; 40%/day, 60%/day, 80%/day and 100%/day, respectively. Stocking density significantly affected fish survival, specific grow rate, growth of absolute length and coefficient of variation (p<0.05) with 2 fry/ℓ density treatment resulted in the best production performance.
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Judul: Analisis dan Implementasi Certificate Authorities (CA) pada Public Switched Telephone Network (PSTN)
Abstrak: Secure Telephone Protocol has ability to authenticate involved party and keep the secrecy of the message sent over the protocol. The secrecy of the message archieved by using symmetric key cryptographic scheme, and authentication archieved using public key cryptographic scheme. One of several party involved in the protocol and hold an important function called Certificate Authorities or CA. CA responsible for generating public key pair for other party involved in the protocol. When CA generates public key pair, several primitive cryptographic scheme used for guarantee the security of the key. Two of them are hash function SHA-1 and El-Gamal public key scheme embedded in Digital Signature Algorithm scheme. The prototype implementing the scheme above developed using Java programming language with JCE addition from Bauncy Castle. The analysis towards implemented prototype indicates that the prototype still has some flaws to be implemented in real world.
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