Judul: Ekostruktur dan sebaran spasial komunitas gastropoda di kawasan pasang surut Teluk Manado, Sulawesi Utara
Abstrak: Tujuan penelitian ini ialah mendeskripsikan ekostruktur komunitas dan sebaran spasial komunitas gastropoda secara umum di kawasan pasang surut serta keterkaitan antara gastropoda dengan karakteristik lingkungannya. Komunitas gastropoda di kawasan pasang surut Teluk Manado temyata bervariasi dalam komposisi, kepadatan dan keanekaragaman per stasiun. Spesies gastropoda yang ditemukan di kawasan pasang surut Teluk Manado terdiri dari 63 spesies (35 genera) masing-masing terdiri dari ordo Archaeogastropoda 10 spesies, ordo Mesogastropoda 18 spesies dan ordo Neogastropoda 35 spesies. Kepadatan total gatropoda masing-masing stasiun pengamatan 6 47 individu/m2 dengan keanekaragaman berkisar antara 2,067-2,809 diklasifikasikan sebagai perairan dengan pencemaran ringan.
Keyword: Ecostructure, sebaran spasial

Judul: Struktur Komunitas Dan Sebaran Spasial Neogastropoda Pada Daerah Pasang Surut Perairan Pantai Pulau Ambon
Abstrak: Penelitian dilakukan pada bulan April hingga bulan Juli 1995 di Daerah Pasang Surut Tujuan dari penelitian Perairan Pantai Pulau Ambon.Tujuan dari Penelitian ini adalah mempelajari struktur dan variasi spasial komunitas neogastropoda serta mengkaji interaksi antara komunitas neogastropoda dan karakteristik habitat pada daerah pasang surut perairan pantai pulau Ambon. Hasil dari penelitian ini dapat merupakan informasi dasar dari struktur komunitas neogastropo- da serta sebaran spasialnya. Pada penelitian ini contoh diambil dari tiga lokasi, yaitu pantai utara dengan 5 stasiun, pantai selatan dengan 4 stasiun dan teluk Ambon 10 stasiun. Struktur komunitas dianalisis melalui perhitungan komposisi spesies, kepada- tan, kesamaan spesies, dan keanekaragaman spesies. Untuk melihat variasi karakteristik habitat digunakan analisis komponen utama (PCA). Sebaran spasial neogastropoda diana- lisis dengan Analisis Koresponden Faktorial (CA)." Hasil penelitian ini menunjukkan bahwa komposisi relatif tertinggi ditemukan pada pantai utara (stasiun Hitu Lama) dan pantai selatan (stasiun Hutumuri) yaitu sebesar 28.77% atau 21 spesies. Kepadatan tertinggi ditemukan pada stasiun di dalam teluk Ambon (stasiun Galala) dengan 109 individu/m². Stasiun-stasiun bagian dalam yang berdekatan mempunyai di teluk Ambon indeks kesamaan spesies yang tinggi. Indeks keanekaragaman di dalam teluk lebih rendah daripada dua lokasi lainnya, hal ini karena di dalam teluk Ambon mendapat gangguan dan tekanan penangkapan ikan serta aktifitas pemukiman yang tinggi…dst
Keyword: Komunikasi Neogastropoda, Interaksi, Habitat Pasang Surut, Pantai Pulau Ambon

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