Judul: Study of mechanical rice transplanting performance in Sukamandi Village, Subang District, West Java
Abstrak: Penanaman bibit padi di lahan sawah dapat dilakukan secara manual dan mekanis menggunakan walking type rice transplanter. Tujuan dari penelitian ini adalah menganalisis unjuk kerja penanaman bibit padi secara manual dan mekanis menggunakan walking type rice transplanter meliputi keseragaman penancapan bibit, kapasitas penanaman, dan biaya penanaman. Hasil penelitian menunjukkan bahwa keseragaman penancapan bibit rata-rata, kapasitas penanaman rata-rata, dan biaya penanaman rata-rata pada penanaman secara manual dan secara mekanis berturut-turut sebesar 75.83% dan 61.41%, 0.009 ha/jam/orang dan 0.143 ha/jam, Rp 666 667/ha dan Rp 476 223/ha., Rice transplanting on rice wet land could be done manually or mechanically utilizing a walking type rice transplanter. The objective of this research was to analyze rice transplanting performances, that are uniformity of rice transplanting, transplanting capacity, and transplanting cost. Result of this research showed that uniformity of rice transplanting, transplanting capacity, and transplanting cost manually and mechanically were 75.83% and 61.41%, 0.009 ha/hour/person and 0.143 ha/hour, and Rp 666 667/ha and Rp 476 223/ha in average respectively.
Keyword: penanaman bibit, manual, walking type rice transplanter, keseragaman penancapan bibit, kapasitas penanaman, dan biaya penanaman.

Judul: Analisis Kinerja Indo Jarwo Rice Transplanter di Balai Pengembangan Mekanisasi Pertanian, Cianjur, Jawa Barat
Abstrak: Mesin tanam bibit padi merupakan alat penanam dengan jumlah, kedalaman, jarak, dan kondisi penanaman yang seragam. Penelitian ini bertujuan untuk melakukan uji kinerja mesin rice transplanter sehingga dapat ditentukan kapasitas lapang untuk menentukan efisiensi lapang, efektivitas penancapan bibit melalui jari penanam, dan penggunaan biaya pada penanaman padi. Penelitian dilakukan di lahan padi dan mesin rice transplanter milik Balai Pengembangan Mekanisasi Pertanian di Cianjur, Jawa Barat. Hasil penelitian menunjukkan bahwa efisiensi lapang tertinggi yang dihasilkan yaitu sebesar 69,08% dengan menggunakan percepatan 2 akan tetapi tidak menghasilkan perbedaan yang signifikan dengan percepatan 1 yang menghasilkan 68,83%. Hasil tersebut dievaluasi dengan SNI 7607:2010 bahwa hasil efisiensi lapang tidak memenuhi hasil minimum dari standar nasional. Efektivitas penancapan bibit yang tertanam hanya mencapai 55% dengan kondisi lahan lumpur yang tidak sesuai dengan spesifikasi mesin. Konsumsi bahan bakar yang didapat yaitu 1,409 liter/jam dan hasil analisa biaya pokok yang dihasilkan sebesar Rp 437.070,-/ha. Hasil penelitian ini dapat digunakan untuk referensi pengujian kinerja mesin tanam bibit padi., A rice planting machine is a machine with a uniform of number, depth, spacing and planting conditions. This study aims to test the performance of a rice transplanter machine so that field capacity can be determined to determine field efficiency, the effectiveness of seeds planting through the finger of the planter, and the use of costs for planting rice. The research was conducted on rice fields and rice transplanter machines belong to the Agricultural Mechanization Development Center in Cianjur, West Java. The results showed that the highest field efficiency produced was 69,08% using forward speed 2 but did not produce a significant difference with forward speed 1 which produced 68,83%. These results were evaluated with SNI 7607:2010 that field efficiency results did not meet the minimum results of the national standard. The effectiveness of seedling planting only reaches 55% with mud land conditions that do not comply with machine specifications. The obtained fuel consumption is 1,409 liters/hour and the resulting basic cost analysis result is Rp. 437.070,-/ha. The results of this study can be used as a reference for testing the performance of rice seed planting machines.
Keyword: Penanaman padi, Efisiensi lapang, rice transplanter, Uji kinerja

Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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