Judul: Aplikasi Penginderaan Jauh dalaln Kajian Sebaran  Karakteristik Dasar Perairan Ekosistem Terumbu Karang di Kepulauan Kangean, Jawa Timur
Abstrak: Ekosistem terumbu karang merupakan ekosistem khas daerah tropik yang mempunyai nilai yang sangat penting baik dari segi ekologis maupun ekonomis. Untuk menjaga kelestarian terumbu karang, maka pemanfaatan dan pengembangan kawasan terumbu karang harus dikelola dan direncanakan sebaik mungkin. Sebagai langkah awal dalam pengelolaan dan pengembangan kawasan terumbu karang adalah tersedianya informasi berupa sebaran dan kondisi terumbu karang. Salah satu cara untuk mendapatkan informasi tersebut secara cepat dengan cakupan wilayah yang luas adalah dengan memanfaatkan teknologi penginderaan jauh.
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Judul: Aplikasi Penginderaan Jauh Dalam Evaluasi Perubahan Terumbu Karang di Taman Nasional Ujung Kulon
Abstrak: Potensi sumber daya terumbu karang di Indonesia sangat besar dan merupakan salah satu negara di kawasan Indomalaya yang mempunyai wilayah terumbu karang yang paling luas. Apabila sumberdaya terumbu karang yang demikian besar tidak diberi perlindungan akan mengalami kehancuran. Penelitian inventarisasi terumbu karang di Indonesia sudah banyak dilakukan. Penelitian yang dilakukan lebih banyak dengan pengukuran langsung sedangkan metode yang memanfaatkan teknologi peginderaan jauh masih sedikit diterapkan. Pengunaan teknologi penginderaan jauh merupakan salah satu alternatif yang tepat untuk invetarisasi terumbu karang bagi negara yang mempunyai wilayah yang sangat luas dan memerlukan waktu yang relatif singkat. Tujuan penelitian ini adalah untuk memetakan sebaran dan kondisi terumbu karang serta melihat dan menghitung perubahan luasan terumbu karang pada daerah tersebut.
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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