Judul: Pengaruh Pemberian Bokashi Kotoran Ayam dan Bokashi Rumput terhadap Beberapa Sifat Fisik Tanah Podsolik Merah Kuning Gajrug dan Pertumbuhan Tanaman Kedelai (Glycine max L. Merr) varietas Willis.
Abstrak: Sebagai suatu altematif baru pada proses pengembalian bahan organik dan penyediaan hara bagi tanaman, teknologi fermentasi bahan organik dengan menggunakan EM-4 (Bokashi) telah diteliti untuk mengetahui pengaruhnya terhadap beberapa sifat fisik tanah Podsolik Merah Kuning Gajrug dan pertumbuhan tanaman kedelai. Penelitian ini dilakukan di rumah kaca dan laboratorium Fisika Tanah, Jurusan Tanah, Fakultas Pertanian, IPB sejak bulan Oktober 1996 hingga Maret 1997. Penelitian ini dilakukan dengan tujuan untuk mengetahui pengaruh pemberian bokashi kotoran ayam dan bokashi rumput terhadap beberapa sifat fisik tanah Podsolik Merah kuning Gajrug dan pertumbuhan tanaman kedelai (Glycine max L. Merr) varietas Willis.
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Judul: Peranan bahan organik bokashi terhadap sifat fisik dan biologi tanah, pertumbuhan, serta produktivitas tanaman kedelai (Glycine max. L.) var. willis pada ultisol Gajrug Jasinga
Abstrak: Kedelai merupakan salah satu komoditas pertanian yang sedang dikembm1gkan. Namun, produksi kedelai di lahan kering masih rendah. Hal ini disebabkan oleh produktivitas lahan yang rendah dan masih banyak lahan yang belum bisa dimanfaatkan secara optimal, salah satunya adalah lahan dengan Tanah Ultisol. Tanah Ultisol mempunyai sifat fisik dan kimia yang buruk untuk pertanian, sehingga dalam pengusahaannya perlu diberikan penggunaan bahan organik. Bokashi merupakan campuran dari berbagai macam bahan organik yang difermentasi dengan EM (Efektif Mikroorganisme)-4. EM-4 merupakan sekelompok mikroorganisme efektif yang terdiri dari bakteri fotosintetik, bakteri asam laktat, ragi cendawan dan aktinomycetes. Teknologi bokashi ini digunakan sebagai salah satu cara untuk memperbaiki kondisi tanah, menekan pertumbuhan mikroorganisme yang menyebabkan penyakit dan memperbaiki efisiensi penggunaan bahan organik. Penelitian ini bertujuan mempelajari pengaruh pemberian bokashi pupuk kandang dan bokashi rumput terhadap beberapa sifat fisik dan biologi tanab, pertumbuhan, serta produktivitas tanaman kedelai (Glycine max L.) var. Willis pacla Ultisol Gajrug, Jasinga.. Penelitian dilakukan di Rumah kaca dan laboratorium Jurusan Tanah, Fakultas Pertanian, Institut Pertanian Bogor. Pengambilan contoh tanah dilakukan di Gajrug, Jasinga, Kabupaten Bogor. Perlakuan yang diberikan adalah pemberian bokashi clan penyiraman EM-4. Pemberian bokashi dengan dua taraf yaitu bokashi pupuk kandang (Bl) dan bokashi rumput (B2), masing-masing dengan vaiiasi dosis 12,5 g/polybag (Kl), 25 g/polybag (K.2), dan 37,5 g/polybag (K3). Perlakuan tersebut clikombinasikan dengan penyiraman EM-4 (El) dan tanpa penyiraman EM-4 (E0). Sebagai pembanding, dilakukan pengamatan terhadap kontrol (E0K0B0 dan ElK0B0).
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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