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: Pengaruh Pupuk dan Interval Defoliasi terhadap Pertumbuhan dan Produksi Tanaman Torbangun (Coleus amboinicus Lour)
Abstrak: This research was conducted to measure the growth and the production of torbangun. The factors are defoliation rate and organic fertilizer . Defoliation was treated in two levels : once per 6 weeks (D1) and once per 9 weeks (D2). Fertilizer treatments were 100% broiler manure fertilizer (PK 3), 75% broiler manure fertilizer with PSB (Phosphate Solubilizing Bacteria) & AMF (Arbuscula Mycorrhizal Fungi) (PK 2), and 50% broiler manure fertilizer with PSB & AMF (PK 1). Each treatment was replicated for 6 times in 18 weeks. The first defoliation was conducted three times while the second defoliation was conducted twice. The measured variables are leaves amount, canopy height, leaf width, fresh weight of leaves, dried weight of leaves. The results showed that the interaction between PK 3 and D1 had the best effect in the increase of leaves amount. PK 3 and PK 2, individually, gave a good impact to the increase of canopy height. The other results showed that PK 2 gave the best impact to dried leaves weight (p<0.05)
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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