Judul: Pengaruh penanaman bengkuang, sentro dan pengembalian biomassanya serta pupuk nitrogen terhadap pertumbuhan dan produksi jagung
Abstrak: Teknologi produksi pertanian yang dimasyarakatkan dan dilaksanakan oleh petani cenderung boros energi dan berpengaruh negatif terhadap kelestarian kesuburan tanah, tanaman, manusia, dan lingkungan. Hal ini sebagai akibat ketergantungan petani pada penggunaan pupuk kimia dan pestisida. Bengkuang dan sentro merupakan tanaman kacang-kacangan yang mampu menambat nitrogen bebas dari udara. Di samping itu bagian-bagian tanaman bengkuang, kecuali umbi mengandung senyawa yang bersifat insektisida yaitu rotenone (C23H22O6). Penanaman dan pengembalian biomassa tanaman tersebut diharapkan dapat mengurangi penggunaan pupuk kimia.
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Judul: Pengaruh Konsentrasi Limbah Air Penggaraman dan Konsentrasi Nitrogen dalam Pupuk Cair Organik terhadap Pertumbuhan dan Produksi Jagung (Zea mays L.)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi limbah air penggaraman, konsentrasi nitrogen dan interaksi keduanya terhadap pertumbuhan dan produksi jagung. Penelitian ini dilaksanakan di Kebun Percobaan IPB Cikarawang. Darmaga, Bogor dari bulan Maret sampai Juni 2005 dengan ketinggian tempat 250 m di atas permukaan laut. Bahan yang digunakan adalah: benih jagung bersari bebas varietas bisma, pupuk anorganik Urea, SP-36, KCl, limbah air penggaraman, pupuk cair organik, perekat pupuk daun, Furadan dan Ridomil. Alat yang digunakan adalah: Sprayer, meteran, jangka sorong, oven, timbangan dan alat pertanian yang biasa digunakan. Percobaan ini menggunakan Rancangan Acak Kelompok faktorial dua faktor. Faktor pertama adalah konsentrasi limbah air penggaraman terdiri atas empat taraf yaitu: 0 cc/l, 2.5 co/1, 5 co/l, 10 cel dan faktor kedua adalah konsentrasi nitrogen terdiri atas empat taraf yaitu: 0 g/l, 5 g/l, 10 g/l, 15 g/l dengan demikian terdapat 16 kombinasi perlakuan, dimana setiap perlakuan diulang sebanyak 3 kali. Dari hasil penelitian dapat disimpulkan bahwa perlakuan konsentrasi limbah air penggaraman dan konsentrasi nitrogen berpengaruh terhadap pertumbuhan jagung. Konsentrasi limbah air penggaraman menurunkan jumlah daun secara nyata pada umur 5 MST, sedangkan konsentrasi nitrogen nyata terhadap tinggi tanaman, diameter batang 4 MST dan indeks luas daun (ILD). Interaksi keduanya berpengaruh nyata terhadap diameter batang 6 MST dan bobot biomasa. Dari data yang diperoleh bahwa limbah air penggaraman cenderung menurunkan produksi jagung, sedangkan konsentrasi nitrogen cenderung meningkatkan produksi jagung.
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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