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: Keragaan Kegiatan Perikanan Ubur-ubur di Pelabuhan Perikanan Nusantara (PPN) Prigi Kab. Trenggalek, .Jawa Timur
Abstrak: Ubur-ubur (Jellyfish) merupakan salah satu sumberdaya laut non ikan yang memiliki nilai ekonomis sehingga mendatangkan pendapatan bagi nelayan pesisir. Namun belum banyak nelayan yang mau menangkap ubur-ubur, ha1 ini dikarenakan nelayan belum mengetahui manfaat dari ubur-ubur dan pangsa pasar yang terbatas. Begitu pula dengan pengolahan membutuhkan suatu metode yang tepat, mengingat ubur-ubur merupakan sumberdaya laut yang mudah busuk sehingga memerlukan penanganan yang tepat. Pengolahan ubur-ubur masih dikuasai oleh investor dari luar negeri seperti Cina dan Taiwan, pengusaha Indonesia belum banyak memberanikan diri untuk ikut berinvestasi dalam bisnis tersebut. Tujuan penelitian ini adalah untuk mendapatkan informasi mengenai keragaan kegiatan perikanan ubur-ubur dengan menentukan pendapatan yang diperoleh setiap unit penangkapan ubur-ubur di daerah Prigi.
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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