Judul: Analisa break-even unit penangkapan ikan di Kotamadya Padang, Propinsi Sumatera Barat
Abstrak: Tujuan penelitian ini adalah untuk menggambarkan keadaan mum perikanan laut dan mengungkapkan keadaan keuangan lima jenis alat penangkapan ikan dengan analisa breakeven. Penelitian ini merupakan studi kasus, yang,dilakukan antara tanggal 15 Febcuari sampai 15 Maret 1982 di Kotamadya Padang, Propinsi Sumatera Barat.
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Judul: Suatu Analisa Unit-Unit Penangkapan Ikan di Kabupaten Ketapang, Kalimantan Barat
Abstrak: Penelitian dilakukan di Kabupaten Ketapang, Kaliman- tan Barat mulai dari tanggal 7 Mei sampai dengan tanggal 9 Juni 1984. Metode yang digunakan dalam penelitian ini adalah metode survai. Tujuan penelitian adalah untuk mengetahui keadaan umum perikanan laut dan menentukan beberapa unit penangkapan ikan yang mempunyai kemungkinan baik untuk dikembangkan di Kabupaten Ketapang. Potensi perikanan laut di Kabupaten Ketapang diduga masih cukup besar. Dengan luas perairan 20 000 km², poten- si perikanan pelagis dan demersal diperkirakan masing-ma- sing sebesar 13 000 ton dan 23 800 ton per tahun. Pada tahun 1983 tingkat usahanya baru mencapai 30,90 persen, sehingga potensi pengembangannya masih 69,10 persen. Pada tahun 1983, di Kabupaten Ketapang terdapat 2 181 unit alat penangkapan ikan yang terdiri dari 10 je- nis, yaitu pukat pantai, jaring insang hanyut, jaring ling- kar, jaring insang tetap, kelong, rawai tetap, serok, pan- cing, sero dan jenis alat lainnya. Perahu dan kapal motor panangkapan ikan berjumlah 1 189 buah yang terdiri dari parahu tanpa motor 734 buah, motor tempel 275 buah dan ka- pal motor 180 buah. Jumlah nelayan sebanyak 2 867 orang. Hak Enam jenis alat penangkapan ikan, yaitu pukat pantai, jaring insang hanyut, jaring lingkar, jaring insang tetap, rawai tetap dan sero telah dianalisa dari segi biologis, efisiensi teknis, efisiensi ekonomis dan analisa sosial. Hasil analisa menunjukkan bahwa jaring lingkar mendu- duki ranking teknologi tertinggi, disusul kemudian oleh jaring insang hanyut, rawai tetap, pukat pantai, jaring insang tetap dan sero. Perairan Kabupaten Ketapang masih dalam taraf kurang upaya (under exploited). Oleh karena itu perlu penambahan upaya (fishing effort) untuk mengelola sumberdaya tersebut, agar potensi perairan Kabupaten Ketapang dapat dimanfaatkan secara optimal….
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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