Judul: Keselektifan ametrina terhadap beberapa varietas tebu
Abstrak: Varietas-varietas tebu Indonesia berbeda kepekaannya terhadap ametrina (2-metiltio-4-(etilamino)-6-(isopropilamino)-s-triazina). Varietas POJ 3067 dan Ps 30 tergolong peka, POJ 3016 agak peka, Ps 8 dan Ps 41 tahan terhadap penyemprotan pada dosis 2 dan 4 kg/ha. Varietas peka ditunjukan oleh gejala keracunan di daun, berkurangnya jumlah tunas serta menurunnya bobot tebu dan hasil gulanya. Varietas yang agak peka ditunjukan oleh gejala keracunan sementara ditajuknya. Tidak terdapat gangguan pertumbuhan tebu dan penurunan hasil panen varietas agak peka dan tahan akibat penyemprotan ametrina.
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Judul: Skema Seleksi Klon Tebu Dan Pengaturan Lingkungan Tumbuh Varietas POJ 3061
Abstrak: Empat varietas di empat lokasi selama tiga tahun di- pergunakan untuk mempelajari pola-pola interaksi. Respons yang diamati adalah hasil tebu, hasil kristal dan rendemen. Rendemen memiliki pola interaksi yang lebih sederhana daripada kedua respons lainnya. Kesederhanaan pola interaksi ini dipergunakan sebagai dasar untuk menyusun skema seleksi klon secara bertahap. Untuk mempelajari struktur pengamatan perubah ganda dipergunakan 136 lingkungan tumbuh varietas POJ 3016 dengan memakai model faktor dan model regresi linier ganda. Varietas POJ 3016 lebih baik dibudidaya di dataran yang letaknya lebih tinggi sedangkan waktu bertanam harus disesuaikan dengan ramalan curah hujan semasa pertumbuhan daun dan per tumbuhan batang dominan. Pada tengah-tahun kedua atmosfer di atas perkebunan tebu kebanyakan diliputi jenis-jenis awan altostratus, nimbostratus atau kumulonimbus. Kehadiran jenis-jenis awan ini diperlukan semasa pertumbuhan daun dominan.
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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