Judul: Penyebaran dan Kelimpahan Beberapa Jenis Keong Gondang (Pila spp.) di Perairan Rawa Pening, Jawa Tengah
Abstrak: Penelitian terhadap penyebaran dan kelimpahan keong gondang di perairan Rawa Pening, Jawa Tengah, dilakukan mulai pertengahan Xaret sampai denpan akhir Mei 1984. Penelitian ini bertujuan untuk mengetahui beberapa aspek ekologi dari keong gondang, disamping menambah informasi mengenai perikehidupannya di Indonesia. Untuk mendapat kan data keong, ditetapkan 5 stasiun pengamatan yang masing-masing terdiri dari 2 transek. Data yang diperoleh berupa jurnlah individu masing-masing jenis keong gondang pada tiap transek pengamatan. Untuk menunjang data tersebut diamati pula kondisi fisika-kirnia perairan yaitu suhu, O2 terlarut, C02 bebas, pH, kesadahan (ca++), kedalaman, dan beberapa faktor lingkungan lainnya.
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Judul: Studi penggunaan Keong Gondang (Pila ampullacea) sebagai alternatif pengendalian gulma air Hydrilla verticillata di Situ Leutik, Darmaga
Abstrak: Penelitian ini bertujuan untuk mengetahui kemampuan konsumsi harian keong gondang terhadap ganggeng, menduga biomassa ganggeng yang terdapat di Situ Leutik, dan mempelajari kemungkinan pengendalian ganggeng dengan menggunakan keong gondang. Hewan uji yang digunakan adalah keong gondang yang dibagi ke dalam 3 kelas ukuran tinggi cangkang. Yaitu ukuran kecil dengan tinggi cangkang antara 4.5-6.0 cm, ukuran sedang dengan tinggi cangkang 6.0-7.5 cm, dan ukuran besar dengan tinggi cangkang lebih dari 7.5 cm. Hasil pengamatan terhadap kemampuan makan keong gondang didapatkan hasil bahwa keong yang berukuran kecil mengkonsumsi ganggeng sebesar 0.07 g/g bobot tubuh/hari, keong berukuran sedang rata-rata mengkonsumsi ganggeng sebesar 0.06 g/g bobot tubuh/hari dan keong berukuran besar mengkonsumsi sebanyak 0.05 g/g bobot tubuh/hari. Hasil estimasi jumlah total biomassa ganggeng di perairan situ Leutik yang luas permukaannya 10.760 m2 didapat 4.673.198,3 gram. Interpolasi data laju pertumbuhan hasil penelitian Taufan (1989) menghasilkan persamaan regresi Y 10,975 0,0073X. Bila kepadatan ganggeng diperairan setara dengan 434 g/m2, maka laju pertumbuhan ganggeng diperairan adalah 7,8% perhari.
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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