Judul: Kajian pengaruh El Nino Southern Oscillation terhadap perikanan Cakalang di Perairan Sorong dan sekitarnya
Abstrak: Penelitian ini bertujuan untuk mengkaji pengaruh ENSO terhadap hasil tangkapan dan hasil tangkapan per upaya penangkapan (CPUE) ikan cakalang (Katsuwonus pelamis, L) di perairan Sorong dan sekitarnya pada tahun 1980 1987. Penelitian ini mengambil lokasi di perairan Sorong dan sekitarnya dimana daerah tersebut merupakan daerah penangkapan utama perikanan pole and line dan perikanan pukat cicin cakalang. Pengambilan data dilakukan pada bulan November 1991 Januari 1992. Data yang digunakan dalam penelitian ini adalah data hasil tangkapan (catch) dan upaya penangkapan (effort) dari kapal-kapal pole and line PT. Usaha Mina di perairan Sorong dan sekitarnya tahun 1980 1987. Kemudian untuk mengetahui terjadinya ENSO digunakan data indeks Osilasi selatan tahun 1980 1987 yang diperoleh dari World Meteorological Organization (WMO). Data pendukung lain yang berupa suhu permukaan laut dan jumlah curah hujan diperoleh dari Badan meteorologi dan Geofisika Jakarta, sedangkan data mengenai keadaan salinitas diperoleh dari LON LIPI.
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Judul: Analisis musim penangkapan dan pemanfaatan sumberdaya Cakalang (Katsuwonus pelamis) di Perairan Sorong, Irian Jaya
Abstrak: Usaha pemanfaatan sumberdaya cakalang di perairan. Sorong pada hakekatnya merupakan usaha perikanan industri yang dilakukan oleh PT Usaha Mina (Persero), sebuah perusahaan Badan Usaha Milik Negara (BUMN) yang telah beroperasi sejak tahun 1973. Dalam rangka meningkatkan produksinya PT Usaha Mina menggunakan rumpon sebagai alat pengumpul ikan. Selain itu juga bekerja sama dengan nelayan tradisional yang tergabung dalam suatu kelompok yang disebut Kelompok Nelayan Tunas Jaya (KNTJ) membentuk pola PIR (Perusahaan Inti Rakyat) penangkapan cakalang dengan PT Usaha Mina sebagai inti dan KNTJ sebagai plasma. Penelitian ini bertujuan untuk menduga pola musim penangkapan ikan cakalang di perairan Sorong dan untuk mengetahui perkembangan pemanfaatan sumberdaya cakalang di perairan Sorong yang dilakukan oleh PT Usaha Mina dan Kelompok Nelayan Tunas Jaya. Metode yang digunakan dalam penelitian ini adalah analisis data sekunder yang meliputi data hasil tangkapan (ton) dan upaya penangkapan (hari operasi) ikan cakalang (Katsuwonus pelamis) di perairan Sorong, Irian Jaya. Data yang digunakan adalah data tahun 1987 - 1992.
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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