Judul: Kajian tekno ekonomi kapal gillnet material kayu diKarangantu Kabupaten Serang Propinsi Banten
Abstrak: Dalam penelitian ini permasalahan yang ingin dipecahkan adalah pengrajin kapal diupayakan mampu untuk membuat analisa tekno-ekonomi didalam prosedur pembangunan kapalnya. Analisa tekno-ekonomi kapal yang dilakukan dilihat mulai dari awal kegiatan pembangunan kapal sampai proses penurunan kapal ke perairan. Penelitian ini bertujuan untuk mengevaluasi dan menganalisa teknik pembangunan kapal serta perhitungan biaya investasi dan biaya operasional pembangunan kepal gillnet yang dibangun di galangan kapal ikan tradisional Karangantu-Serang. Penelitian ini dilakukan dalam dua tahap yaitu tahap pengumpulan data dan tahap analisa data. Jenis data, cara pengumpulan data dan analisa data disesuaikan dengan pencapaian tujuan penelitian.
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Judul: Development Analysis on Gillnet Fisheries in Karangantu Waters, Serang District - Banten Province
Abstrak: Research on gillnet fisheries in Karangantu waters of Serang District has been conducted from November 2005 to April 2006. This research was aimed to : 1) Identifying factors influencing the gillnet productivity, 2) Analysing economic performance of the gillnet fisheries and 3) Formulating alternative policies on gillnet fisheries development in the area. Data collecting was carried out trought purposive sampling of respondents, interviewing by using prepared questionnares, with using descriptive and survey method. Cobb-Douglas ( Soekartawi, 1999) method was used to determine the factors influencing the gillnet productivity. SWOT analysis ( Mulyono, 1996) and Analytical Hierarchy Process, AHP ( Saaty, 1993) were used for the formulation of the policies. Result of the research shows that from seven independent factors, the net size was indicated to be the most factors influencing the gillnet fisheries productivity. The production model of Cobb-Douglas was Y=0,31-0,041X1+0,78X2+0173X3- 0,0453+0,057X5+0,83X6-0,472X7 with its accuracy data 95% and determinant factor 83,3%. Gillnet fisheries in Karangantu is most dominantly used and show profitable performance (BEP Rp.10.915.000,-/year at the production volume of 4.461 kg/year, net B/C value 1,54, NPV Rp. 54.738.293,- and IRR 74,49%). The earnings of gillnet fishers is above Serang District regional minimum wage rate (2005). The following development strategies were recommended: 1) Controlling the number of fishing gear and fishing effort, 2) Arrangement and controlling the fishing ground (DPI) based on fishing gear and increasing the security assurance, 3) Skill improvement for the gillnet fishers, providing capital investment and marketing, 4) Increasing the size of fishing boat and gillnet size, accurate and timely statistic data are desperately needed.
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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