Judul: Studi efektifitas dua formulasi atrazine dalam mengendalikan gulma pada pertanaman tebu (saccharum officenarum L.) di lahan kering
Abstrak: Penelitian ini bertujuan untnk mengetahui efektifitas dua formulasi atrazine pada beberapa tingkat dosis dalam mengendalikan gulma pada pertanaman tebu lahan kering. Penelitian dilaksanakan pada bulan Agustus 1997 sampai dengan Oktober 1997 di pertanaman tebu lahan kering Pabrik Gula Jati Tujuh, PT Rajawali Nusantara, lndramayu, Jawa Barat. Metode penelitian disusun menggunakan rancangan acak kelompok (RAK) faktor tunggal. Susunan perlakuan terdiri atas 3 ulangan sebagai kelompok dan 12 perlakuan pengendalian gulma. Perlakuan pengendalian gulma terdiri atas dua formulasi herbisida atrazine yaitu Atrazine 80 WP dan Atrazine 500 FW masing-masing dengan dosis 1, 2, 3, 4 kg/ha dan 1, 2, 3, 4 l/ha. Sebagai pembanding digunakan herbisida Gesaprim 80 WP (750 g/kg atrazine) dan Gesapri.Jn 500 FW (475 g/l atrazine) masing-masing dengan dosis 2 kg/ha dan 2 l/ha, perlakuan manual dan perlakuan kontrol. Total satuan percobaan adalah 36 buah. Petak percobaan berukuran 6.25 m x 10 m untuk setiap satu satuan percobaan, sehinggga luas lahan seluruhnya 2 250 m2. Pengamatan dilakukan pada persentase penutupan gulma total, bobot kering gulma dominan dan keracunan terhadap tanaman tebu. Pada awal dan akhir percobaan dilakukan analisis vegetasi. Hasil analisis vegetasi sebelum dan setelah aplikasi atrazine menunjukkan adanya empat spesies dominan di areal percobaan, yaitu : Echinochloa coloman, Digitaria adscendens, Borreria alata dan Mimosa invisa.
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Judul: Efektivitas Dua Formulasi Herbisida Glifosat Untuk Pengendalian Gulma pada Pertanaman Tebu (Saccharum officinarum L.) di Lahan Kering
Abstrak: Penelitian ini dilakukan pada bulan April hingga Juli 1999 di pertanaman tebu lahan kering Pabrik Gula Jati Tujuh, M' Rajawali Nusantara, Indramayu, Jawa Barat. Penelitian ini disusun dengan menggunakan rancangan acak kelompok (RAK) faktor tunggal. Susunan perlakuan terdiri atas 4 ulangan sebagai kelompok dan 12 perlakuan pengendalian gulma. Susunan perlakuan terdiri atas dua formulasi herbisida glifosat yaitu glifosat 13 % dan glifosat 24 % masing-masing dengan dosis 2, 3, 4, 5, 6 l/ha dan 2, 3, 4 l/ha. Herbisida pembanding yang digunakan adalah herbisida glifosat 240 g/l dosis 3 l/ha dan glifosat 480 g/l dosis 1.5 l/ha. Dilakukan juga perlakuan manual dan perlakuan kontrol.
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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