Judul: Studi Keefektivan Herbisida Diuron dan Ametrin untuk Mengendalikan Gulma pada Pertanaman Tebu (Saccharum officinarum. L) Lahan Kering
Abstrak: Berdasarkan hasil analisis vegetasi sebelum aplikasi herbisida diuron dan ametrine didapatkan empat spesies gulma dominan yaitu Digitaria adscendens, Borreria alata, Cleome rutidosperma dan Cyperus kyllingia. Spesies gulma lain sebelum aplikasi herbisida ini adalah Commelina diffusa, Fymbristillis milliaceae, Cardiospermum halicacabum dan Centella asiatica. Hasil analisis vegetasi akhir memberikan gambaran umum tentang dominasi gulma setelah aplikasi herbisida.
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Judul: Pengaruh herbisida diuron 78.5% WP terhadap pengendalian gulma pada pertanaman tebu (Saccharum officinarum L.)
Abstrak: Percobaan ini dilakukan untuk mengetahui pengaruh dan keefektifan herbisida Maron 80 WP ( Diuron 78.5 %) pada berbagai tingkat dosis dalam mengendalikan gulma pada pertanaman tebu. Penelitian ini dilakukan di PG Rajawali II Subang Jawa Barat pada bulan Desember 2010 sampai Maret 2011. Penelitian menggunakan rancangan acak kelompok dengan faktor tunggal dan terdiri dari empat ulangan. Perlakuan yang diberikan adalah : Herbisida Maron 80 WP dengan dosis 2.0 kg/ha, herbisida Maron 80 WP dengan dosis 1.5 kg/ha, Herbisida Maron 80 WP dengan dosis 1.0 kg/ha, Herbisida Maron 80 WP dengan dosis 0.5 kg/ha, pengendalian manual dan kontrol. Berdasarkan analisis vegetasi sebelum aplikasi herbisida didapatkan empat spesies gulma dominan yaitu Digitaria adscendes, Borreria alata, Cleome rutidosperma dan Brachiaria distachya. Spesies gulma lain sebelum aplikasi herbisida ini adalah Cynodon dactylon, Croton hirtus, Alocasia maccorhiza. Hasil analisis vegetasi akhir memberikan gambaran umum tentang dominasi gulma setelah aplikasi herbisida. Perlakuan herbisida Maron 80 WP (Diuron 78.5%) pada semua taraf dosis yang diberikan cukup efektif dalam mengendalikan gulma hingga 10 Minggu Setelah Aplikasi (MSA). Secara umum aplikasi herbisida Maron 80 WP (Diuron 78.5%) memberikan hasil yang berbeda nyata dengan perlakuan tanpa pengendalian (kontrol) dalam menekan bobot kering gulma total, gulma daun lebar dan gulma rumput. Perlakuan pengendalian manual kurang efektif dalam mengendalikan gulma dipertanaman tebu lahan kering. Hal ini dilihat dari biaya pengendalian yang cukup tinggi yaitu Rp. 350.000,00/ha dan bobot kering gulma yang masih tinggi. Selama percobaan tidak ditemukan gejala keracunan pada tanaman tebu yang sampai mematikan tanaman. Gejala keracunan ringan hanya terdapat pada sebagian kecil tanaman contoh yang diamati.
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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