Judul: Penentuan Beban Pencemaran dan Status Kualitas Perairan Sungai Karang Mumus Akl'bat Buangan Bahan Organik
Abstrak: Tujuan penelitian ini adalah untuk menentukan beban pencemaran dan status kualitas air Sungai Karang Mumus serta memperkirakan tingkat pencemaran pada waktu yang akan datang. Kegiatan penelitian telah dilaksanakan di perarran Sungai Karang Mumus, Kotamadya Samarinda dan Laboratorium Manajemen Sumberdaya Perairan, Fakultas Pertanian Universitas Mulawarman pada tanggal 5 September -28 Desember 1996. Pengamatan dilakukan di delapan lokas, enam lokasi berada di perairan Sungai Karang Mumus, yaitu stasiun 1 sampai dengan stasiun 6 serta dua lokasi berada di perairan Sungai Mahakam, yaitu stasiun 7 dan stasiun 8. Pengambilan contoh air dilakukan di setiap stasiun secara komposit vertikal dan horizonta dengan menggunakan alat "kemmerer water sampler", sebanyak empat kali dengan interval waktu setiap dua minggu. Stasiun (lokasi) pengambilan contoh untuk hewan bentos makro sama dengan kualitas air. Hewan bentos makro yang berada di alas dan di dalam lumpur sedirnen diambil dengan menggunakan " Ekman grab ". Identifikasi dilakukan dengan mengggunakan kunci identifikasi menurut Quigley (1977), Edmondson (1959) dan Jutting (1953 dan 1956). dst ...
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Judul: Beban Masukan Bahan Organik Dan Kemampuan Swapurifikasi Sungai Karang Mumus Di Samarinda
Abstrak: Tujuan penelitian adalah untuk mengetahui kemampuan swapurifikasi sungai dan pengaruh beban masukan bahan organik (BOD) dari hulu (Waduk Benanga) terhadap kualitas air Sungai Karang Mumus. Pengukuran lapangan dilakukan enam kali setiap dua minggu selama bulan April sampai Juli 1995, di bagian hulu dan tengah sepanjang 12.8 km. Metode pendekatan yang digunakan yaitu model pencampuran untuk mengoreksi setiap efluen dan model defisit oksigen. Hasil penelitian menyimpulkan bahwa: 1) Beban masukan bahan organik dari Waduk Benanga adalah yang paling besar dibandingkan efluen anak-anak sungai dan pengaruhnya paling dominan di sepanjang 12.8 km aliran Sungai Karang Mumus. 2) Kemampuan swapurififasi Sungai Karang Mumus bagian hulu dan tengah masih baik, yaitu memiliki konstanta f > 1. 3) Tidak ada zonasi defisit oksigen, sebagian bahan organik terangkut ke luar muara sungai. 4) Penurunan kadar bahan organik (BOD, COD, dan TOM) berkorelasi positif dengan penurunan kadar CO, dan NO, di sepanjang 12.8 km aliran dari hulu.
Keyword: Bahan Organik, Sungai Karang Mumus, Hidrodinamika Sungai, Purifikasi Sungai

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