Judul: Penyebaran dan Kelimpahan Udang Palaemoninae di Muara Sungai Buntu Kabupaten Sidoarjo Jawa Timur
Abstrak: Penelitian ini dilakukan dari tanggal 19 Maret sampai dengan 7 Mei 1984. Tujuan penelitian adalah untuk mengetahui penyebaran di knel impahan udang Palaemoninae yang dipengaruhi oleh faktor lingkungan di muara Sungai Buntung, Kabupaten Sidoarjo, Jaiva Timur. Alat tangkap yang digunakan adalah 'small beam trawl' dengan ukuran mata jaring 3 mm. Alat tangkap ini di tarik perahu bermotor berkekuatan 10 tenaga kuda dengan kecepatan rata-rata 6 km per jam selama lima menit atau dengan jarak sapuan sepanjang 500 m setiap pengambilan contoh. Stasiun pengambilan contoh ditentukan sebanyak enam buah berdasarkan posisi dan jarakterhadap mulut muara dan garis pantai.
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Judul: Studi tentang komposisi, distribusi dan kelimpahan udang palaemonidae di sekitar Muara sungai Jenggalou Desa Kandang, Kecamatan Talang IV, Kabupaten Bengkulu Utara
Abstrak: Penelitian ini dilakukan dari pertengahan Agustus sampai dengan akhir bulan Oktober 1987. bulan Tujuan penelitian adalah untuk mengetahui komposisi, distribusi, dan kelimpahan udang Palaemonidae di sekitar muara Sungai Jenggalou pada waktu surut, serta kaitannya dengan faktor fisika dan kimia perairan. Stasiun pengambilan contoh ditentukan sebanyak 6 (enam) buah berdasarkan keadaan umum lingkungan dan jarak dari muara ke arah hulu sungai. Jarak antar stasiun masing- masing lebih kurang 1.5 km. Alat tangkap yang digunakan adalah "Small Beam Trawl" dengan ukuran mata jaring 3 mm. Alat tangkap ini dioperasikan dengan perahu motor tempel berkekuatan 18 PK dengan kecepatan rata-rata 4 km per jam ditarik sejauh 2 x 100 meter pada setiap stasiun. Penang- Kapan udang contoh dan pengukuran parameter fisika-kimia perairan dilakukan sekali dalam seminggu selama 11 minggu pada keadaan surut. Selama Palaemonidae penelitian ditemukan 4 (empat) jenis udang dengan komposisi masing-masing sebagai berikut; udang Leandrites celebensis (De Man) sebesar 81.84% Macrobrachium equidens (Dana) sebesar 16.14 %, Palaemon serrifer (Stimpson) sebesar 1.13% dan Palaemon concinnus (Dana) sebesar 0.88% Udang L. celebensis tertangkap di semua stasiun pengambilan contoh dengan kelimpahan semakin besar Ke arah (Stasiun VI). Udang M. equidens tertangkap hilir di semua stasiun dengan kelimpahan tertinggi pada stasiun V. Udang P. serrifer tertangkap pada stasiun II dan III, sedangkan P. concinnus hanya tertangkap di stasiun V. Dari hasil penelitian didapatkan bahwa suhu perairan di sekitar Sungai Jenggalou berkisar antara 27.0 32.0 - dengan rataan 29.8 C; Kedalaman 1.5 C, 3.09 meter; kecerahan 1.88 -1.18 meter; salinitas 6 32%.; dan PH perairan 6.5 7.5 dengan rataan 7.8. - kimia perairan Parameter fisika dan tersebut diduga masih mendukung kehidupan yang layak bagi udang Palaemonidae…dst
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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