Judul: Pengaruh Berbagai Taraf Nitrogen terhadap Pertumbuhan Bambu Betung (Dendrocalamus asper (Schultes f.) Backer ex Heyne)
Abstrak: Bambu betung merupakan jenis bambu yang sarat akan kegunaan diantaranya : sebagai alat bantu konstruksi bangunan, jembatan, kerajinan, dan rebungnya dikonsumsi sebagai sayuran. Selama ini sebagian besar tanaman bambu betung dibiarkan tumbuh secara alami, belum ada budidaya yang intensif. Dengan demikian hasil yang ada belum dapat emenuhi permintaan.
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Judul: Pengaruh pemupukan terhadap pertumbuhan anakan bonggol bambu betung (Dendrocalamus asper (Schultes f.) Backer ex Heyne)
Abstrak: Bambu merupakan tanaman serbaguna dan menempati tempat yang istimewa dalam kehidupan masyarakat Indonesia. Bambu mempunyai banyak manfaat misalnya untuk pangan (rebung), alat-alat rumah tangga, konstruksi, tanaman hias, bahan baku industri dan pencegah erosi (Surjokusumo, 1996). Potensi bambu ini di Indonesia belum banyak diteliti dan dimanfaatkan, padahal Indonesia termasuk negara yang kaya akan keanekaragaman jenis bambu. Salah satu jenis bambu yang mempunyai prospek yang cukup baik, terutama untuk produksi rebung, furniture dan bahan baku industri adalah bambu betung (Dendrocalamus asper). Bambu ini berpotensi untuk dikembangkan dalam skala besar untuk memenuhi kebutuhan bambu yang semakin meningkat sejalan dengan menurunnya produksi kayu. Jenis bambu ini masih perlu penanganan dalam hal perbanyakan, manajemen dan pemupukan untuk memproduksi rebung dan batang bambu. Sistem perbanyakan yang cukup efektif untuk bambu ini adalah perbanyakan secara vegetatif, dan untuk menunjang keberhasilan budidaya bambu ini diperlukan perlakuan pemupukan. Penelitian ini bertujuan untuk mengetahui pengaruh pemupukan terhadap pertumbuhan anakan bonggol bambu betung serta untuk mendapatkan gambaran mengenai dosis pupuk terbaik dalam menunjang keberhasilan perbanyakan bambu ini. Penelitian ini dilaksanakan di Arboretum Bambu IPB Darmaga selama kurang lebih 8 bulan, mulai bulan Maret 1997 sampai November 1997. Bahan yang digunakan dalam penelitian ini adalah stek bambu betung, pupuk NPK 15-15-15, Hyponex 20-20- 20, kompos pupuk kandang (kotoran sapi), tanah Latosol Darmaga dan air. Anakan bambu betung diambil dari rumpun bambu yang berumur sekitar 1 tahun. Bahan tanaman diambil dengan memotong akar rimpang (rhizome), yang kemudian direndam...
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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