Judul: Komposisi dan distribusi makrozoobenthos di Perairan Estuaria mauk, Kabupaten Tangerang Jawa Barat
Abstrak: Negara Indonesia merupakan negara kepulauan luas yang dipisahkan oleh laut. Sedemikian luasnya negara Indonesia sehingga memerlukan suatu cara pengelolaan sumberdaya maupun pemanfaatannya secara optimal dan lestari. Salah satu sumberdaya alam yang mulai banyak diperhatikan adalah sumberdaya alam pesisir yang diantaranya adalah perairan estuaria. Dalam komunitas organisme perairan, benthos memegang beberapa peranan penting seperti dalam proses mineralisasi dan pendaurulangan bahan organik, serta menduduki beberapa posisi dalam rantai makanan. Organisme makrozoobenthos ini juga membantu dalam mengidentifikasi tingkat pencemaran karena mempunyai tingkat kepekaan yang berbeda beda terhadap berbagai jenis pencemar dan memberikan reaksi yang cepat terhadap perubahan yang terjadi, mempunyai kemampuan mobilitas yang rendah sehingga sangat mudah dipengaruhi oleh keadaan lingkungan di sekitarnya dan mudah ditangkap dan diidentifikasi Tujuan dari penelitian yang akan dilaksanakan untuk mendapatkan informasi faktor-faktor fisika dan kimia perairan dan sedimen yang mendukung keberadaan makrozoobenthos dan menganalisa berapa besar keterkaitan antara faktor fisika atau kimia tersebut terhadap keberadaan makrozoobenthos, mengetahui berapa besar keterkaitan antara faktor biologi perairan dengan faktor fisika dan kimia perairan, menganalisa komposisi dan distribusi makrozoobenthos di sekitar perairan dengan menggunakan data primer. Penelitian ini dilaksanakan dari tanggal 27 Oktober sampai tanggal 28 November 1998 yang berlokasi di sepanjang perairan Estuaria Mauk, Daerah TK. II Kabupaten Tangerang, Propinsi Jawa Barat.
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Judul: Distribusi Spasial Zooplankton di Perairan Pesisir Kabupaten Tangerang
Abstrak: Zooplankton is important component in marine food chain. The observation was conducted in the coastal waters of Tangerang with the purpose to provide information regarding the spasial distribution of zooplankton and its relation to the water quality which is presumed to be affected by material input from several nearby rivers. During research there were found 12 groups of zooplankton which consist of Protozoa, Rotifera, Crustacea, Ctenophora, Chaetognata, Urochordata, Nematoda, larvae of Coelenterata, larvae of Echinodermata, larvae of Gastropoda, larvae of Polychaeta, and larvae of Pelecypoda. The spasial distribution of zooplankton showed that zooplankton separated into two locations: location 1 (Kronjo, Mauk, Rawa Saban, and Tanjung Pasir Station) and location 2 (Dadap Station). The water quality of Tangerang Coastal Waters was proper for optimum life of zooplankton. Ammonia and salinity indicated to be more influence towards the distribution of zooplankton in the coastal waters of Tangerang Regency.
Keyword: Bogor Agricultural University (IPB), zooplankton, coastal waters of Tangerang Regency, spatial distribution

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