Judul: Pengaruh Jenis Zat Pemadat dan Konsentrasi 2,4-D terhadap Produksi Tunas Mikro Kentang (Solanum tuberosum L.) CV. Russet Burbank secara in vitro
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh jenis zat pemadat dan berbagai taraf konsentrasi asam 2,4 diklor fenoksi asetat (2,4-D) terhadap produksi tunas mikro kentang. Penelitian ini dilakukan di Laboratorium Biomolekuler dan Seluler Tanaman, Pusat Antar Universitas, Institut Pertanian Bogor, dan dimulai bulan Desember 1992 sampai bulan April 1993.
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Judul: Pengaruh 2,4-D dan air kelapa terhadap produksi stek mikro kentang (Solanum tuberosum L.) CV Russet Burbank
Abstrak: Percobaan dilakukan di laboratorium kultur jaringan, Pusat Antar Universitas (PAU), Bioteknologi, Institut Pertanian Bogor, Dramaga. Percobaan di mulai dari bulan Pebruari sampai bulan Juni 1993. Percobaan ini bertujuan melihat pengaruh 2,4-D dan air kelapa terhadap produksi stek mikro kentang. Percobaan terdiri dari dua faktor, yaitu 2,4-D dan air kelapa. Faktor 2,4-D terdiri dari 5 taraf konsentrasi yaitu: 0.02 ppm (11), 0.04 ppm (12), 0.06 ppm (13), 0.08 ppm (14) dan 0.10 ppm (15). Faktor air kelapa terdiri da- ri 3 taraf konsentrasi yaitu: 0% (K1), 15% (K2) dan 30% (K3). Selain kombinasi perlakuan dari dua faktor tersebut percobaan ini juga mencakup perlakuan kontrol (tanpa 2,4-D dan air kelapa). Eksplan yang ditanam adalah tunas aksi- lar dari kultivar Russet Burbank. Jumlah perlakuan ada 15 dengan tambahan 1 perlakuan kontrol. Setiap perlakuan diulang 5 kali. Pengamatan dilakukan setiap minggu selama 4 minggu pertama terhadap jumlah tunas dan jumlah buku. Panen tunas mikro dilakukan pada minggu IV, VII dan X. Pada setiap panen dilakukan pengamatan terhadap jumlah tu- nas, jumlah buku dan jumlah stek mikro. Dari tiga kali panen dihitung jumlah stek mikro total dan penggandaan jumlah buku. Air kelapa dan 2,4-D menunjukkan interaksi yang nyata dalam mempengaruhi jumlah buku, jumlah stek mikro dan penggandaan jumlah buku. Perlakuan media dengan 2,4-D 0.04 ppm dan air kelapa 15% (perlakuan terbaik dari 15 perlakuan yang dicobakan) menghasilkan jumlah buku, jum- lah stek mikro dan penggandaan buku yang tidak berbeda nyata dengan kontrol, namun menunjukkan kecenderungan ha- sil yang meningkat dari panen I ke panen III, sementara kontrol menunjukkan kecenderungan hasil yang menurun. Se- lain itu secara kualitas stek mikro yang dihasilkan perla- kuan 2,4-D 0.04 ppm dan air kelapa 15% lebih baik daripada kontrol….
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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