Judul: Analisis keragaman perbanyakan stek nenas(Ananas comosus (L.) Merrill) Varietas queen
Abstrak: Perbanyakan pada nenas umumnya melalui tiga materi utama perbanyakan, yaitu tunas ketiak daun (suckers), tunas batang (slips) yang tumbuh di bawah buah, dan mahkota (crowns) (Hartmann & Kester, 1959). Metode perbanyakan ini memiliki keterbatasan dalam jumlah dan keseragaman ukuran materi tanam yang dihasilkan, terutama pada crowns, jarang digunakan untuk penanaman secara-besar-besaran di perkebunan besar dikarenakan ukurannya tidak seragam (Wee & Thongtham, 1997). Penelitian ini mencoba menginduksi tunas dorman dengan perlakuan pembelahan dan pemberian zat pengatur gatur tumbuh (BAP) dalam kondisi rumah kaca. Kendati diperbanyak dari organ vegetatif, tidak menutup kemungkinan terjadinya perbedaan keragaan pada tanaman yang berasal dari satu klon tanaman. Penelitian ini bertujuan untuk mengetahui pengaruh pembelahan batang dan perendaman batang dengan zat pengatur tumbuh (BAP) terhadap keberhasilan perbanyakan stek pada nenas dan terhadap keragaman fenotipik pada populasi hasil perbanyakan, serta pengaruh interaksi antara perlakuan pembelahan batang dan perendaman batang dengan zat pengatur tumbuh (BAP) terhadap keberhasilan perbanyakan stek dan keragaman fenotipik pada populasi hasil perbanyakan. Percobaan dilaksanakan di rumah kaca Pusat Kajian Buah-buahan Tropika, Baranangsiang, Bogor, berlangsung dari Desember 2002 sampai Oktober 2003. Bahan perbanyakan yang diujicobakan yaitu batang Nenas Bogor asal Desa Tajur Halang. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak tiga faktor dengan tiga unit ulangan. Faktor pertama, pembelahan eksplan menjadi dua (C1) dan empat (C2) bagian. Faktor kedua, tanpa perendaman dengan BAP (S1) dan perendaman dengan BAP 4 mg/l (S2). Faktor ketiga, pembelahan batang membujur menjadi batang ujung (P1), batang tengah (P2), dan batang pangkal (P3). Hasil penelitian menunjukkan bahwa tidak terdapat pengaruh interaksi antara perlakuan pembelahan batang, perendaman batang dengan zat pengatur tumbuh (BAP), dan bagian batang terhadap keberhasilan perbanyakan stek dan keragaman fenotipik pada populasi hasil perbanyakan. Eksplan batang yang dibelah dua lebih banyak menghasilkan materi tanam dengan ukuran bibit yang lebih baik dibandingkan eksplan batang yang dibelah empat. Perendaman eksplan dengan BAP 4 mg/l mempercepat pemecahan dormansi tunas dorman serta jumlah tanaman yang diperoleh lebih banyak dibandingkan eksplan tanpa perendaman dengan BAP 4 mg/l. Penggunaan batang bagian ujung memberikan hasil yang lebih baik dalam hal kecepatan pecahnya dormansi tunas, jumlah bibit yang diperoleh dan ukuran bibit.
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Judul: Analisis keragaman perbanyakan stek nenas (Ananas comosus (L.) Merrill) varietas queen
Abstrak: The different propagules (suckers, shoots, slips, crowns) have already been described. When an industry is just starting it may be necessary to maintain special nurseries for fast propagation. The stems are cut lengthwise and are sectioned. In principle each bud can grow out to a new plant, provided their nutrition is assured and the apical dominance is broken. The different group should be kept separate and must be sorted for size, so that a field is planted with uniform material. In order to develop rapid method for propagation of pineapple, the experiment that employ three factors, i.e. the section of stem used for propagation (upper-stem, middle-stem, lower stem), the number of vertical division (two and four), and growth regulator (BAP 0 mg/I and BAP 4 mg/l), conducted under green house condition at Pusat Kajian Buah-buahan Tropika (PKBT), Baranangsiang, Bogor, from December 2002 to October 2003, evaluated 'Nenas Bogor's stems, taken from Desa Tajur Halang. It was arranged in Completely Randomized Design (CRD) with three replications. The obtained data was subjected to analyze of variance homogeneity, analyze of variance, and analyze of correlation. The result indicated the using of the upper-stem and BAP 4 mg/l gave the highest number of planted materials and the fastest breaking of apical dominance. The using of two sectioned stem gave the highest number of planted materials and simultaneously gaye the best performance of planted materials. The experiment described that small variation was found within cuttings propagations' population. The variant is duplicated or triplicated plant.
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Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice