Judul: Sebaran Larva Plantonik Di Wilayah Pesisir Suaka Margasatwa Muara Angke - Kapuk, Teluk Jakarta
Abstrak: Penelitian ini laksanakan pada bulan Januari dan Juni 2001 di kawasan Suaka Margasatwa Muara Angke, Teluk Jakarta dimana perairan ini merupakan salah satu ekosistem yang berfungsi sebagai tempat bernaungnya berbagai jenis organisme penyusun keanekaragaman hayati. Kondisi Suaka Margasatwa Muara Angke sampai sa at ini mempunyai fungsi konservasi dan berkedudukan di wilayah Jakarta. Sudah seharusnya kondisi kawasan dan tata laksana pengelolaan Suaka Margasatwa _ Muara Angke dijalankan dengan baik karena melihat kondisi habitat (hutan mangrove) telah mengalami kerusakan yang cukup berat, keanekaragaman jenis flora dan fauna, serta populasi belum teridentifikasi. Tujuan dari penelitian ini adalah untuk mengetahui komposisi dan sebaran larva planktonik di wilayah Suaka Margasatwa dan pesisir Muara Angke, Teluk Jakarta.
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Judul: Struktur Komunitas dan Distribusi Horizontal Zooplankton di Perairan Pesisir Muara Angke dan Sunda Kelapa, Teluk Jakarta.
Abstrak: Penelititan ini bertujuan untuk mengetahui struktur komunitas dan distribusi horizontal zooplankton di perairan pesisir Muara Angke dan Sunda Kelapa, Teluk Jakarta. Hasil penelitian ini diharapkan dapat bermanfaat bagi penentuan status dan pengelolaan perairan pesisir Teluk Jakarta. Penelitian dilakukan di 6 stasiun pengamatan. Pengambilan contoh dilakukan 2 kali yaitu pada tanggal 22 Juli dan 5 Agustus 1999. Penentuan stasiun pengamatan berdasarkan pada tingkat perubahan salinitas dari tepi ke tengah perairan dan pengaruh aktivitas di daratan. Sampel zooplankton diambil dengan cara menyaring 100 1 air permukaan dengan menggunakan plankton net (ukuran mata jaring 64 pm). Sampel diawetkan dengan menambah formalin 40%, hingga konsentrasi menjadi 4-5%. Identifikasi dilakukan di Laboratorium Bio Makro. Analisis data yang dilakukan meliputi kelimpahan, komposisi jenis, pola penyebaran, pengelompokan habitat, keanekaragaman, keseragaman, dan dominansi.
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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