Judul: Karakteristik fisika-kimia air di sekitar perairan Pulau Pagerungun  Besar, Propinsi Jawa Timur
Abstrak: Penelitian ini dilakukan dengan menganalisis karakteristik fisika-kimia air di sekitar perairan Pulau Pagerungun Besar. Tujuan Penelitian ini adalah melihat pengaruh pembuangan limbah cair akibat adanya pengembangan gas oleh EMP Kangean Limited. Kegiatan pokok yang dilakukan adalah eksploitasi gas dan selanjutnya disalurkan melalui pipa transmisi gas Jawa timur untuk Perusahaan Listrik Negara, Perusahaan GAs Negara dan Petro Kimia Gresik. Selain adanya pengembangan gas, juga dihasilkan buangan berupa limbah cair. Jenis limbah cair yang dihasilkan dari seluruh rangkaian kegiatan produksi EMP Kangean Limited adalah berupa limbah cair terproduksi yang diolah dengan hydrocyclone, limbah cair domestik yang diolah dengan STP (Sewage Treatment Plant), dan limbah air larian (run off) yang diolah dengan API Separator. Informasi yang diperoleh dari kajian ini diharapkan dapat dijadikan sebagai masukan dalam upaya meminimalisasi dampak negatif yang mungkin timbul akibat adanya pembuangan limbah cair tersebut
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Judul: Karakteristik Fisika Kimia Perairan dan Kaitannya dengan Struktur Komunitas Plankton di Perairan Sekitar Pulau Pagerungan, Sumenep, Jawa Timur
Abstrak: Lautan merupakan satu-satunya tempat kumpulan organisme yang sangat besar di bumi. Organisme-organisme tersebut sangat bevariasi dan mewakili seluruh fila. Organisme tersebut sangat dipengaruhi oleh sifat air laut di sekelilingnya. Salah satu organisme yang paling banyak jumlah dan jenisnya di lautan adalah plankton. Kehidupan plankton amat dipengaruhi oleh parameter fisika kimia lingkungan. Perubahan terhadap parameter fisika kimia perairan akan berakibat pula terjadinya perubahan populasi plankton, yang selanjutnya berpengaruh terhadap organisme lain karena plankton merupakan produsen dan konsumen tingkat pertama dalam jala-jala makanan.
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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