Judul: Studi tentang perikanan ubur-ubur (Jellyfish) dan pengaruh arus terhadap hasil tangkapannya di perairan Kotamadya Dati II Pasuruan, Jawa Timur
Abstrak: Penelitian dilakukan di Kotamadya Dati II Pasuruan dan daerah perairan Selat Madura di sekitar Kodya Pasuruan, pelaksanaannya dimulai dari bulan Mei sampai Juli 1991. Penelitian ini bertujuan untuk mendeskripsikan kegi- atan perikanan ubur-ubur di daerah yang diteliti dan meng- kaji pengaruh arus terhadap total hasil tangkapan ubur- ubur. Kegiatan perikanan ubur-ubur yang ada di Kodya Pasu- ruan dimulai dari kegiatan operasi penangkapan di laut yang dilakukan oleh nelayan setempat, hingga ke proses penanganan yang dilakukan oleh perusahaan-perusahaan penampung yang beroperasi di Pelabuhan Kodya Pasuruan. Selama pengamatan berlangsung didapati letak daerah penangkapan ubur-ubur yang cenderung semakin ke arah barat, sebanding dengan arah arus saat tersebut dengan kecenderungan hasil tangkapan yang semakin menurun. Dari hasil perhitungan diperoleh nilai koefisien korelasi rank (Spiermen) antara serentetan pasangan nilai kecepatan arus dan hasil tangkapan per unit kapal adalah,0891. Kisaran...
Keyword: Ubur-ubur, Jellyfish, Pasuruan, Jawa Timur

Judul: Suatu Studi Tentang Perikanan Laut Kabupaten Pasuruan, Propinsi Jawa Timur : Kemungkinan Pengembangan Jenis-Jenis Unit Penangkapan Ikannya
Abstrak: Penelitian ini bertujuan untuk mengetahui keadaan umum perikanan laut dan menganalisa kemungkinan pengembangan je- nis unit penangkapan ikan yang baik untuk daerah penelitian, ditinjau dari segi biologis, teknis dan ekonomis. Metode yang digunakan dalam penelitian ini adalah "me- tode survai", dimana data primer diperoleh melalui wawanca- ra langsung dengan nelayan dan data sekunder diperoleh dari instansi-instansi yang ada kaitannya dengan perikanan di daerah penelitian. Wilayah Kabupaten Pasuruan terletak pada koordinat se- kitar 112°30' BT 113°30' BT dan 7°30' LS - 8°30' LS. Per - airan Kabupaten Pasuruan diperkirakan mempunyai potensi les tari perikanan pelagis sebesar 1.800 ton/tahun dan perikan- an demersal sebesar 4.500 ton/tahun. Produksi perikanan laut Kabupaten Pasuruan pada tahun 1980 mencapai 6.984,1 ton, sehingga untuk daerah ini sudah mengalami tangkap le bih (overfishing) sebesar 684,1 ton atau 10,86% dari poten si lestari seluruhnya.
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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