Judul: Pertumbuhan dan produksi pada gogo pada beberapa taraf kisaran kelengasan tanah, di dalam dan di luar rumah kaca
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh beberapa kisaran kelengasan tanah terhadap pertumbuhan dan produksi padi gogo, yang ditanam di dalam rumah kaca dan di luar. Diharapkan hasil penelitian ini dapat digunakan untuk mengetahui sampai pada batas kisaran kelengasan ta- nah berapa padi gogo masih dapat tumbuh dan berproduksi dengan baik. Penelitian dilaksanakan pada bulan Agustus sampai de- ngan Desember 1988, bertempat di rumah kaca Jurusan Ilmu- ilmu Tanah Kampus IPB Baranangsiang Bogor dengan altitude 266 meter di atas permukaan laut. Rancangan percobaan yang digunakan pada penelitian ini adalah Rancangan Petak Terpisah (Split-plot Design), dengan faktor tempat (naungan kaca) sebagai petak utama dan faktor ketersediaan air tanah sebagai anak petak. Hasil penelitian menunjukkan bahwa perbedaan keadaan iklim antara di dalam rumah kaca dan di luar memberikan pengaruh terhadap pertumbuhan dan produksi tanaman. Selain itu, pertumbuhan tanaman juga sangat dipengaruhi oleh kandungan air tanah tersedia. Tinggi tanaman, jumlah anakan dan bobot kering tanaman bertambah dengan semakin ...
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Judul: Pertumbuhan dan hasil tanaman padi gogo pada berbagai perlakuan agronomis
Abstrak: Dengan latar belakang potensi dan peranan padi gogo pada masa mendatang dalam menaikkan produksi beras nasional dan dalam rangka usaha untuk mengatasi sebagian dari kendala pertumbuhan dan hasil padi gogo, maka dilaksanakan serangkaian percobaan di lapangan dan di kamar kaca. Penelitian ini terdiri dari tiga percobaan yaitu (1) Pengaruh cara pengendalian gulma dan pengolahan tanah terhadap pertumbuhan dan hasil padi gogo pada waktu tanam yang berbeda; (2) Pengaruh gulma terhadap kadar air dan hara tanah serta pertumbuhan dan hasil padi gogo dan (3) Pengaruh jumlah air terhadap pertumbuhan dan hasil padi pogo. Percobaan pertama dilakukan di lapangan sejak Juli 1986 hingga Maret 1987. Percobaan dua dan tiga dilakukan di kamar kaca sejak April sampai dengan September 1987.
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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