Judul: Pengaruh jenis zat penghambat tumbuh dan sitokinin terhadap pengumbian in vitro kentang (Solanum tuberosum)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi beberapa jenis sitokinin dan zat penghambat tumbuh yang diberikan pada konsentrasi optimum terhadap pembentukan dan produksi umbi mikro kentang pada sistem pengumbian cair-cair. Penelitian dilaksanakan di Labora- torium Kultur Jaringan, Jurusan Budidaya Pertanian, Fakul- tas Pertanian, IPB dan berlangsung sejak bulan Januari 1990 sampai Juni 1990. Penelitian ini merupakan percobaan faktorial dengan dua faktor yaitu jenis sitokinin dan jenis zat penghambat tumbuh, masing-masing terdiri atas 4 jenis zat pengatur tumbuh. Perlakuan diberikan pada media pengumbian. Per- cobaan ini menggunakan media dasar Murashige dan Skoog (MS) ditambah sukrosa 3% untuk media pertunasan dan 9% pa- da media pengumbian. Pada kedua jenis media ditambahkan 4 ppm Ca Pantotenat. Percobaan terdiri atas 3 tahap yaitu tahap perbanyak- an eksplan, tahap pertunasan dan tahap pengumbian. Per- lakuan diberikan pada tahap pengumbian. Jenis Sitokinin yang digunakan ialah 5 ppm BA, 10 ppm Kinetin, 50 ppm Be- nomyl dan 100 ppm Adenin Sulfat. Sedangkan jenis zat...
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Judul: Pengaruh nitrogen dan jenis sitokinin terhadap pengumbian kentang (Solanum tuberosum L.) secara in  vitro yang di induksi coumarin
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh berbagai taraf nitrogen (N) pada media pertunasan serta pengaruh nitrogen (N) dan jenis sitokinin pada media peng- umbian terhadap produksi umbi mikro kentang sistem cair- cair yang diinduksi coumarin. Penelitian ini dilakukan di Laboratorium Kultur Jaringan Budi Daya Pertanian, Institut Pertanian Bogor, mulai September 1990 hingga Juni 1991. Penelitian ini merupakan percobaan faktorial yang terdiri dari 3 faktor dan disusun secara acak lengkap. Faktor pertama adalah N pada media pertunasan dengan 5 ta- raf perlakuan, yaitu: 7.5 mM (T1), 15.0 mM (T2), 30.0 mM (T3), 60.0 mM (T4) dan 120.0 mM (Ts). Faktor kedua terdi- ri dari jenis sitokinin, masing-masing pada konsentrasi optimum, yaitu Kinetin 10 ppm (S1) dan Benzyladenine 5 ppm (S2). Faktor ketiga adalah N dengan 2 taraf, yaitu 7.5 mM (U1) dan 60.0 mM (Uz). Faktor kedua dan ketiga merupakan perlakuan pada media pengumbian. Seluruhnya ada 20 kombi- nasi perlakuan dengan 10 ulangan. Dalam penelitian ini tunas mikro kentang kultivar Red Pontiac digunakan sebagai eksplan. Media pertunasan ter- diri dari komposisi media Murashige Skoog (MS) cair yang dimodifikasi sesuai perlakuan....
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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