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: Studi Perbandingan komunitas makrozoobentos dengan pendekatan ekologis di perairan pesisir Jawa
Abstrak: Saat ini perubahan pada ekosistem pesisir semakin berkembang luas, baik berupa konversi lahan atau pencemaran. Studi mengenai bentos, sebagai salah satu indikator kondisi perairan, telah cukup banyak dilakukan tapi umumnya pada lokasi atau kepentingan tertentu. Studi perbandingan ini mencoba memadukan komunitas makrozoobentos di beberapa lokasi perairan pesisir Jawa sebagai usaha pengelolaan yang lebih luas dan terpadu. Selanjutnya diharapkan akan tampak kecenderungan atau signifikasi ekologis dari area perairan ini. Studi didasarkan pada data sekunder bersifat primer dari penelitian Kastoro dan kawan-kawan (peneliti dari LP30 LIPI) tahun 1989 dan 1991. Enam lokasi perairan pesisir Jawa yang menjadi lokasi studi yaitu laguna Grajagan, estuari Porong, estuari Wonokromo, estuari Bengawan Solo keempatnya di Jawa Timur; dekat pantai dan lepas pantai Kepulauan Seribu keduanya di DKI Jakarta. Analisa komponen utama digunakan dalam menggambarkan parameter fisik yang lebih berpengaruh pada perairan. Komposisi dan dominasi komunitas dilihat dari jumlah jenis dan kepadatan. Sedangkan penggambaran korespondensi makrozoobentos dengan perairan menggunakan Analisa korespondensi. Selanjutnya kondisi dan karakteristik komunitas digambarkan dengan model grafik suksesi, indeks keragaman, dan keseragaman. ...
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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