Judul: Soil temperature modification for growth adaptability of buckwheat (Fagopyum esculentum Moench) in human tropics
Abstrak: Buckwheat ios a subtropical crop which produces flour, it can be grown well in tropical region at upland but lowland wich has higher air temperature the growing is suppressed with lower yield. An attempt has been done to modify soil temperature buckwheat cultivation and to analyze the influece of different soil temperature pattern to the root growth and the yield of buckwheat. The experiment was conducter during April-Juy, 2003 at Ciawi, Bogor district which locsted at 400 m above sea level. The Split Plot Design with three replications was employed with the main plot was two population densities, viz no mulch (M0), straw mulch (M1), and a sheet of transparent plastic (M2). Two cultivars of buckwheat, viz Kitawasesoba (V1) and Hitachi Akisoba (V2) were planted in sequence. The results showed that the soil temperature under M2 always the highest, while the lowest was under M0 in the morning and under M1 during noon and afternoon. There were no interaction between popupation densities and mulch to the tield. The straw mulch of M1 produced the highest yield of 2.60 ton ha(-1) and 3.42 ton ha(-1) for Kitawasesoba and Hitachi Akisoba, respectively.
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Judul: Pengaruh Naungan dan Jarak Tanam terhadap Tanaman Soba di Dataran Menengah Kopo, Cisarua – Jawa Barat.
Abstrak: Buckwheat is a crop that has many benefits such as for alternatif food and sustainable agriculture in Indonesia. This study was conducted to determine the effect of shading and plant spacing on growth and development, radiation interception, radiation use efficiency and heat accumulation on buckwheat cultivar Harunoibuki. The experiment was conducted in May – Juli 2012 in Kopo Intermediateland, Cijulang, Cisarua, West Java at 600 meters above sea level. This study used nested experimental design with two factors and three replications; shading conditions of buckwheat: N0 (no shading) and N1 (shading by paranet 55%) as main factor; while plant spacing: P1 (200 plants/m2) and P2 (50 plants/m2) as second factor. Shading and plant spacing have significant effect on height, leaf number, and total dry mater of plant. Population density of 200 plants/m2 was able to intercept radiation 10 – 30% more than population density of 50 plants/m2. Radiation use efficiency on treatment of P1/N0, P2/N0, P1/N1, and P2/N1 were 3.11, 2.13, 2.76, and 2.65 g/MJ. Plants with the shading required 1380 0C day and plants without shading required 1239 0C day until harvest time. Plant without shading has double productivity compared to plant with shading.
Keyword: Buckwheat, cultivar Harunoibuki, heat accumulation, radiation use efficienc, yield components. Buckwheat

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