Judul: Kajian Kualitas Air Sungai Siak di  Kotamadya Pekanbaru dan Kecamatan Siak Kabupaten Bengkalis
Abstrak: Sungai Siak memegang peranan penting bagi kehidupan masyarakat Propinsi Riau, karena dapat dimanfaatkan untuk berbagai aktivitas, seperti transportasi, industri, pertanian, perkebunan, perminyakan dan perikanan. Disamping itu air Sungai Siak juga dimanfaatkan oleh masyarakat yang ada di sekitamya untuk keperluan rumahtangga. Selanjutnya air Sungai Siak juga digunakan oleh PDAM Siak Tirta sebagai bahan baku air minum bagi masyarakat Kotamadya Pekanbaru dan sekitamya. Pemanfaatan Sungai Siak ini, apabila tidak diatur dengan baik akan menimbulkan terjadinya bentrokan antar kepentingan yang mengakibatkan terganggunya ekosistem sungai, yaitu turunnya kualitas air. Tujuan penelitian ini adalah mengevaluasi kualitas air Sungai Siak saat dilakukannya penelitian dan mempelajari pengaruh perubahan kualitas air Sungai Siak terhadap kehidupan masyarakat sekitarnya. Metode penelitian yang digunakan adalah metode survei untuk pengamatan lapangan, pengambilan contoh air, pengamatan parameter fisik lingkungan serta pengambilan responden dengan menggunakan kuesioner dan wawancara langsung. Pengambilan contoh air didasarkan pada banyaknya aktivitas manusia di sekitar DAS tersebut. dst ...
Keyword: Natural resources management

Judul: tudi lingkungan perairan sungai Siak bagian hilir dari pencemaran bahan organik: studi kasus di Kecamatan Siak Sri Indrapura
Abstrak: Penelitian lingkungan perairan Sungai Siak bagian hilir yang termasuk dalam wilayah Kecamatan Siak Sri Indrapura dilakukan terhadap obyek pengamatan kualitas air dari pencemaran bahan organik dan sikap penduduk dalam menggunakan air Sungai Siak sebagai sumber air tawar. Parameter kualitas air sungai yang diukur ialah komponen biotik, khususnya bakteri coli, dan komponen abiotik, yaitu suhu, pH, TOM, oksigen terlarut, BOD,, COD, CO 2 , NH3 , NO 3 , minyak dan lemak serta parameter pendukung lainnya. Hasil analisis kualitas air Sungai Siak tersebut menunjukan bahwa parameter seperti, BOD,, COD, terlarut, minyak dan lemak serta bakteri coli, oksigen telah melampaui nilai ambang batas yang ditetapkan, sesuai dengan Kep-02/MENKLH/I/1988 dan PP. RI No. 20 Tahun 1990, untuk air golongan B, yaitu air yang dapat digunakan sebagai air baku air minimum. Sedangkan dari perhitungan Indeks Mutu Lingkungan Perairan (IMLP) berdasarkan Ott (1978), ternyata perairan Sungai Siak ter golong tercemar sedang 66.67 persen dan tercemar berat 33.33 persen. Status sosial ekonomi dan tidak adanya sumber air tawar lain serta sudah terbiasanya menggunakan air Sungai Siak secara turun-temurun menyebabkan sikap penduduk tetap memanfaatkan air sungai untuk keperluan mandi, cuci dan kakus (MCK)
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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