Judul: Kemampuan Aestivasi dan Mortalitas Juvenil Siput Murbei (Pomacea sp.)
Abstrak: Penelitian kemampuan aestivasi dilakukan selama 6 bulan ( 8 Januari - 8 mei 1993) di Kolam Percobaan Babakan, Fakultas Perikanan dan mortalitas juveniI selama 4 5 hari (1 Juni - 14 Juli 1993) di Laboratorium Biofogi Air, FakuItas Perikanan Institut Perranian Bogor. Tujuan dari penelitian ini adalah untuk mengetahui kemampuan aestivasi serta mengebhui mortalitas juvenil siput rnurbei sebagai upaya untuk mendapatkan inforrnasi mengenai titik kekuatan dan kelemahan dari tingkah laku siput rnurbei sepanjang daur hidupnya.
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Judul: Studi pertumbuhan dan aspek reproduksi siput murbei (Pomacea sp.)
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh pemberian tumbuhan air Hydrilla verticillata, Eichhornia crassipes dan Salvinia molesta terhadap pertumbuhan siput murbei berukuran kecil, sedang dan besar, serta untuk mengeta- hui aspek-aspek biologi reproduksi siput murbei yang meliputi jumlah butir telur tiap gumpalan, tinggi peletakan telur di atas permukaan air, diameter telur dan persentase penetasannya. Penelitian ini dilaksanakan di Laboratorium Biologi Air, Fakultas Perikanan, Institut Pertanian Bogor dari bulan Mei sampai dengan Juli 1992. Penelitian pertumbuhan dilaksanakan dengan rancangan acak kelompok percobaan faktorial 3 x 3, dan mempergunakan 5 buah akuarium berukuran 60 cm x 30 cm x 40 cm yang disekat dengan kaca menjadi 2 bagian. Untuk setiap unit percobaan dipergunakan 3 ekor siput murbei yang berbeda ukuran, yaitu ukuran kecil (tinggi cangkang < 20 mm), ukuran sedang (tinggi cangkang antara 20-35 mm), dan ukuran besar (tinggi cangkang > 35 mm). Sebelum penelitian dimulai, hewan uji diadaptasikan dengan media uji dan salah satu jenis pakan selama 6 hari. Pakan alami Hydrilla verticillata, Eichhornia crassipes dan Salvinia molesta diberikan dalam jumlah cukup setiap 1-2 hari sekali Penimbangan biomassa dan pengukuran tinggi cangkang siput murbei dilakukan 2 minggu sekali selama 10 minggu. Pengukuran tinggi cangkang dilakukan dari bagian puncak apex sampai bagian terluar aperture. Penelitian aspek reproduksi hanya dilakukan secara pengamatan (observasi). Dalam penelitian ini, pertama kali dilakukan pengukuran tinggi peletakan gumpalan telur yang menempel pada dinding akuarium, tembok kolam maupun tumbuhan air, dan selanjutnya gumpalan telur tersebut diambil untuk dihitung jumlah telurnya dengan metode gravimetrik dan diukur diameter telurnya. Sebagian telur kemudian ditetaskan dengan cara direndam dalam air, diapungkan di permukaan air, ditempelkan pada sepotong kaca, dan diletakkan di tempat kering. ...
Keyword: Reproduksi siput murbei, Pomacea sp., Hydrilla verticillata, Eichornia crassipes, Salvinia molesta

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