Judul: Studi pendugaan stok beberapa jenis sumberdaya ikan Demersal dengan metode Swept Area di Perairan Utara Semarang-Pekalongan
Abstrak: Pemanfaatan sumberdaya perikanan demersal di Indonesia meningkat terus dari tahun ke tahun. Hal ini disebabkan oleh sumberdaya ikan demersal merupakan sumber protein yang dibutuhkan oleh masyarakat, karena kebutuhan akan makanan tidak hanya terbatas pada pemenuhan kalori yang dapat dicukupi dengan peningkatan produksi pangan seperti beras dan jagung. Mengingat pentingnya sumberdaya ikan demersal sedangkan pengetahuan kita tentang stok sumberdaya ikan demersal masih sangat kurang, maka perlu dilakukan penelitian secara berkesinambungan. Penelitian ini bertujuan untuk menduga keadaan stok beberapa jenis ikan demersal yang dominan. Kegunaan penelitian ini adalah memberikan informasi kepada penentu kebijakan perikanan dalam pengelolaan sumberdaya perikanan yang bersangkutan. Metode yang digunakan adalah metode survai. Data primer diperoleh dari hasil pengamatan langsung di lapang dengan metode swept area. Pencatatan/pengambilan data mengikuti cara yang dilaksanakan oleh Sub Balai Penelitian Perikanan Laut Semarang.
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Judul: Studi pendugaan stok Ikan Demersal dengan metode Swept Area pada bulan Januari 1995 di Perairan Selat Makassar, Propinsi Kalimantan Timur
Abstrak: Pemanfaatan sumberdaya perikanan demersal di Indonesia meningkat terus sepanjang tahun. Hal ini disebabkan oleh sumberdaya ikan demersal merupakan salah satu sumber protein yang dibutuhkan oleh masyarakat, karena kebutuhan akan makanan tidak hanya terbatas pada pemenuhan kalori yang dapat dicukupi dengan peningkatan produksi pangan seperti beras dan jagung. Mengingat pentingnya sumberdaya ikan demersal sedangkan pengetahuan kita tentang stok sumberdaya ikan demersal masih sangat kurang, maka perlu dilakukan penelitian secara berkesinambungan. Penelitian bertujuan untuk menduga keadaan stok beberapa jenis ikan demersal yang dominan. Kegunaan penelitian ini adalah memeberikan informasi kepada penentu kebijakan perikanan dalam pengelolaan sumberdaya perikanan yang bersangkutan. Metode yang digunakan adalah metode swept area yaitu stratified random sampling dengan bentuk jalur pelayaran secara zig-zag. Hasil yang diperoleh menunjukkan bahwa total hasil tangkapan adalah sebesar 2821,20 kg dengan rata-rata laju tangkap 108,94 kg/jam, stock density 0,29 ton/km² dan standing stock 157,34 ton pada daerah penelitian seluas 1826,52 km². Komposisi hasil tangkapan adalah famili Dasyatidae sebesar 23,7 %, famili Ariidae sebesar 20,1%, famili Lutjanidae 13,5%, famili Carcharhidae 9,5%, famili Leiognathidae 5,5%, famili Pomadasydae 5,2%, famili Nemipteridae 5,0% dan famili lain 17,5%. ...
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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