Judul: Pengaruh Jarak Tanam dan Pemupukan Terhadap Pertumbuhan dan Produktivitas Tanaman Torbangun (Coleus amboinicus Lour)
Abstrak: This research was conducted to study the effects of plant spacing and fertilizer on the growth and productivity of Torbangun plant (Coleus amboinicus Lour). The experimental design used in this research was t-test for fertilizer manure: poultry (PA) and cattle (PS). This research was done based on completely randomized design (CRD) with 4 plant spacing treatments 0.5 x 0.5 m (J1), 0.5 x 1 m (J2), 1 x 1 m (J3), 1.5 x 1 m (J4). It is shown that poultry manure significantly resulted in better on the growth and productivity compared to that of cattle manure. Plant spacing significantly affected the variables rate of the increasing number of leaves with poultry manure, production number of leaves with poultry manure in the second period, dry weight of Torbangun leaves with cattle manure in the second period. Plant spacing of 1 x 1 m (J3) and 1 x 1.5 m (J4) was the highest on the growth and productivity of Torbangun plant with the application of either 1 kg poultry manure or cattle manure
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Judul: Pertumbuhan dan Produksi Daun Torbangun (Plectranthus amboinicus Spreng.) dengan Pemupukan Organik dan Pemangkasan
Abstrak: Torbangun is a nutritious crop that increase breast milk because it contains lactagogen. Most study of torbangun plants focuses on pharmacological characteristics of plant. There is a need for research in cultivation techniques using organic fertilizer and pruning. The purpose of this study was to investigate the effect of organic fertilizer and pruning on the growth and leaf production of torbangun plant. This study used randomized block design (RBD) in the first experiment with fertilizer factor and Split plot design in the second experiment with fertilizer and pruning. Both of the experiment used Tukey‟s (Honestly Significant Difference) test. Organic fertilization is divided into 5 levels: without fertilizer, cow manure+rock phosphate, cow manure+rice-hull ash, rock phosphate+rice-hull ash, and cow manure+rock phosphate+rice-hull ash. Pruning is consisted of 2 levels: without pruning and with pruning. The results showed that fertilization using cow manure + rock phosphate + rice-hull ash increased shoot fresh weight of 125.21% compared to without fertilization. Pruning reduced plant biomass and leaf number. Torbangun growth is slow, so harvesting should have been done in a longer interval.
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Judul: Pendeteksian dan Pengidentifikasian Cheaters pada Skema Pembagian Rahasia Shamir
Abstrak: Kepemilikan informasi rahasia tanpa membuat kunci salinan cadangan akan berisiko mengalami kehilangan. Skema Pembagian Rahasia hadir sebagai solusi pendistribusian kunci cadangan dengan kemungkinan tingkat kerahasiaan dan keandalan yang tinggi. Ide dari skema ini adalah membagi rahasia dan mendistribusikannya menjadi keping rahasia sedemikian sehingga sejumlah atau lebih keping rahasia dapat memulihkan rahasia asli. Shamir (1979) pertama kali memperkenalkan skema pembagian rahasia miliknya dengan menggunakan konsep perhitungan dalam lapangan untuk suatu bilangan prima , sehingga keamanannya terjaga. Namun dalam beberapa penelitian, keamanan skema Shamir dari serangan cheaters masih tak terelakkan. Harn dan Lin (2009) melakukan penelitian dengan menambahkan algoritme deteksi dan identifikasi cheaters pada tahap penyatuan ulang skema Shamir. Skema tersebut pada akhirnya dapat mendeteksi dan mengidentifikasi cheaters yang dikategorikan menjadi tiga tipe serangan. Karya ilmiah ini mengulas bagaimana konstruksi algoritme pendeteksian dan pengidentifikasian cheaters pada skema Harn dan Lin, dengan asumsi dealer dan partisipan jujur menyerahkan keping kunci yang sah.
Keyword: skema pembagian rahasia, Shamir, deteksi, identifikasi, cheaters