Judul: Pengaruh Media Serbuk Gergaji dengan Pemberian Kotoran Ayam dan Pemupukan NPK terhadap Pertumbuhan Semai Duabanga moluccana BI
Abstrak: Penggunaan tanah lapisan atas (topsoil) untuk media semai dalam skala besar akan menimbulkan dampak lingkungan yang merugikan, dan bobotnya yang besar menyebabkan biaya angkut mahal. Serbuk gergaji, yang merupakan limbah industri kayu yang belum dimanfaatkan secara optimal, dijadikan alternatif media tumbuh sebagai pengganti tanah lapisan atas.
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Judul: Pengaruh proses pembuatan media terhadap semai duabanga moluccana BL.
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh pembocoran kantong media pengomposan selama masa inkubasi terhadap pertumbuhan semai D. moluccana Bl. IPB Penelitian dilaksanakan di Laboratorium Silvikultur dan Rumah Kaca Fakultas Kehutanan IPB pada bulan April sampai dengan Agustus 1997. Rancangan penelitian yang dilakukan adalah rancangan faktorial 4 x 5 dalam pola acak lengkap yaitu komposisi media (faktor A) dan waktu pembocoran kantong media (faktor B), dengan 3 kali ulangan. Analisis data dilakukan secara statistik dan uji lanjutan menggunakan Uji Jarak Duncan dan Uji Dunnet dengan kontrol berupa media tanah Latosol. Interaksi antara faktor komposisi media dengan waktu pembocoran kantong media mempunyai pengaruh yang sangat nyata terhadap pertambahan tinggi semai. Media campuran dedak dan serbuk gergaji 1: 2 dengan pembocoran kantong media pada hari ke-10 (A2B2) memberikan rata-rata pertambahan tinggi semai sebesar 7.53 cm atau lebih besar 60.2%. Hasil sidik ragam terhadap pertambahan diameter semai menunjukkan bahwa faktor komposisi media (A), faktor waktu pembocoran kantong media (B) dan interaksi antara kedua faktor tersebut memberikan pengaruh yang sangat nyata. Media dengan komposisi dedak dan serbuk gergaji 1:2 (A2) memberikan diameter rata-rata tertinggi sebesar 1.39 mm. Perlakuan pembocoran kantong media pada hari ke-10 (B3) memberikan pertambahan diameter rata-rata sebesar 1.42 mm. Sedangkan media dedak tanpa perlakuan pembocoran kantong media (A0B0) memberikan pertambahan diameter rata- rata tertinggi sebesar 1.93 mm atau lebih besar 80.4% dari kontrol. Berdasarkan hasil sidik ragam, interaksi antara faktor komposisi media dengan waktu pembocoran kantong media pada masa inkubasi memberikan pengaruh yang sangat nyata terhadap berat kering total semai. Hasil Uji Jarak Duncan menunjukkan bahwa perlakuan...
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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