Judul: Komunitas Meiobentos dan Kualitas Sedimen dalam Mintakat Redoks Potensial di Perairan Pesisir Muara Jaya, Bekasi
Abstrak: Penelitian ini dilakukan pada bulan April 1997 di tujuh stasiun pengamatan dan empat lapisan kedalaman sedimen di perairan pesisir Muara Jaya, Bekasi. Adapun tujuan dari penelitian ini adalah untuk melihat dan mengkaji hubungan kualitas sedimen dan komunitas meiobentos yang terdapat dalam mintakat redoks potensial sedimen. Sebaran spasial kualitas sedimen (parameter fisika-kimia sedimen) dikaji dengan menggunakan Analisis Komponen Utama. Analisis komunitas meiobentos dilakukan melalui penghitungan kelimpahan, keanekaragaman, keseragaman dan dominansi spesies. Sementara itu, untuk melihat sebaran spasial meiobentos dan hubungannya dengan kualitas sedimen digunakan Analisis Faktorial Koresponden. Lebih lanjut untuk mengetahui kelimpahan spesies meiobentos dilakukan uji kesesuaian dengan model distribusi kelimpahan spesies yakni : Seri Geometri (Motomura), Seri Logaritma (Preston) dan Broken Stick Model (Mc Arthur). Dari kisaran nilai parameter fisika-kimia air dan parameter fisika-kimia sedimen yang terukur di perairan Muara Jaya terlihat, bahwa sebagian besar parameter tersebut menunjukkan nilai-nilai yang telah melebihi ambang batas baku mutu yang diperbolehkan bagi kehidupan biota laut (Kep. Men. KLH No. 2th 1988). Komposisi sedimen dasar perairan Muara Jaya terdiri dari fraksi liat (39.06 %), pasir (38.32%) dan lumpur (22.62%). Kondisi sedimen dasar perairan Muara Jaya yang ditinjau dari nilai redoks potensial (Eh), derajat kemasaman (pH) dan kandungan bahan organik (C-organik) pada semua stasiun pengamatan dan lapisan kedalaman sedimen memperlihatkan distribusi vertikal dan mempunyai mintakat redoks potensial yang termasuk kedalam kategori zona reduksi, yang tidak mendukung kehidupan organisme meiobenthos. dst ...
Keyword: Komunitas meiobentos, perairan Pesisir, mintakat

Judul: Analisis pencemaran dan karakteristik sedimen terhadap struktur komunitas zoobentos di perairan pesisir kotamadya Palu
Abstrak: Penelitian ini dilaksanakan pada bulan September 1999 di tujuh stasiun penmgamatan dan tiga lapisan kedalaman sedimen di perairan pesisir Kotamadya Palu. Adapun tujuan Dari Penelitian ini adalah untuk mengkaji struktur komunitas zoobentos sebagi indikator kondisi perairan pesisir Kotamadya Palu dan menentukan keterkaitan antara struktur komunitas zoobentos dan karakteristik sedimen perairan pesisir Kotamadya Palu. Hipotesis penelitian adalah karaketristik fisik-kimia dans edimen dasar perairan mempengaruhi struktur komunitas zoobentos dalam setiap lapisan. Sebaran spasial parameter fisik-kimia air laut dikaji dengan menggunakan Analisis Komponen Utara yang mencakup analisis faktor dan analisis diskriminan. Analisis komunitas meibentos dilakukan melalui perhitungan kelimpahan, keaneragaman, keseragaman, dan dominasi kelas sedangkan pengaruh parameter fisik-kimia dengan struktur komunitas meibentos digunakan analisis regresi linear berganda.
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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