Judul: Komposisi, kelimpahan, dan distribusi kopepoda di perairan Teluk Jobokuto, Pantai Kartini, Jepara
Abstrak: Penelitian ini bertujuan untuk mempelajari komposisi jenis kopepoda, kelimpahan, keanekaragaman, keseragaman dan dominansi serta sebaran kopepoda di perairan Teluk Jobokuto, Jepara. Pengamatan parameter biologi meliputi kelimpahan kopepoda yang termasuk ke dalam kelompok holoplankton. Parameter fisika kimia yang diukur meliputi suhu, oksigen terlarut, pH, salinitas, kecepatan arus, kedalaman. Parameter fisika kimia dianalisis secara in situ. Hasil identifikasi sanıpel kopepoda selama pengamatan di perairan Teluk Jobokuto, Jepara ditemukan sebanyak 18 jenis dari 13 marga dan 3 ordo. Calanoida mendominasi dalam jumlah spesies maupun kelimpahannya untuk tiap kali pengamatan di tiap-tiap stasiunnya, pada bulan Juli dan September 2003, diikuti oleh jenis-jenis Harpacticoida, sedangkan Poecilostomatoida memiliki persentase jenis terkecil. Kisaran kelimpahan total kopepoda pada semua stasiun mencapai 33-4533 ind/m³. Indeks keanekaragaman kopepoda berkisar antara 0,00 1,74; indeks keseragaman antara 0,001; sedangkan indeks dominansi antara 0,23-1. Hasil perhitungan menunjukkan bahwa tiap jenis Kopepoda di perairan Teluk Jobokuto termasuk dalam kategori pola penyebaran mengelompok (dimana nilai l>1). Parameter fisika kimia di kawasan Teluk Jobokuto, Jepara selama pengamatan masih berada pada kisaran yang masih mendukung kehidupan kopepoda. Suhu rata-rata di perairar, sekitar Teluk Jobokuto berkisar antara 27,5 - 29 °C. Nilai kedalaman selama pengamatarı berkisar antara 0,85-8,25m. Kecepatan arus berkisar antara 3,43-13,13 cm/detik. pH berkisar antara 7,25-8. Salinitas rata-rata berkisar antara 26-32 ppt. Oksigen terlarut rata-rata berkisar antara 5,576,70 mg/l.
Keyword: distribusi, kopepoda, Teluk Jobokuto

Judul: Komposisi, Kelimpahan, dan Distribusi Kopepoda di Perairan Teluk Semangka, Lampung.
Abstrak: Kualitas fisika-kimia perairan di Teluk Semangka selama pengamatan berada pada kisaran yang layak bagi kehidupan Kopepoda. Kisaran nilai suhu berkisar antara 28,5 - 3 1,25'~, pH berkisar antara 7,85 - 8,37, salinitas berkisar antara 8 - 34%0, kekeruhan berkisar antara 0,21- 13 NTU, kecerahan berkisar antara 0,6 - 31m, dan oksigen terlarut berkisar antara 5,93 - 8,3 mgtl. Dari hasil penelitian di perairan Teluk Semangka ditemukan 22 genera Kopepoda dari ordo Calanoida (13 genera), Poecilostomatoida (5 genera), Cyclopoida (1 genus), dan Harpacticoida (3 genera). Berdasarkan kelimpahannya, persen rata-rata komposisi Kopepoda selama penelitian terdiri dari Calanoida 85,04%, Poecilostomatoida 7,50%, Cyclopoida 5,05%, dan Harpacticoida sebesar 2,41%. Nilai indeks keanekaragaman Kopepoda di perairan Teluk Semangka selama pengamatan berkisar antara 0,76-2,80. Buian Juli berkisar antara1,15-2,80, bulan Oktober berkisar antara 0,81-2,74, dan bulan Deseinber berkisar antara 0,76-2,02. Nilai indeks keseragaman Kopepoda di perairan Teluk Semangka selama pengamatan berkisar antara 0,55-1,OO. Bulan Juli berkisar antara 0,57-0,93, bulan Oktober berkisar antara 0,74-1,00, dan bulan Desember berkisar antara 0,55-1,OO. Nilai indeks dominansi Kopepoda selama pengamatan di perairan Teluk Semangka berkisar antara 0,16-0,65. Bulan Juli berkisar antara 0,16-0,61, bulan Oktober berkisar antara 0,18-0,63, dan bulan Desember berkisar antara 0,25-0,65. Kelimpahan Kopepoda di perairan Teluk Semangka selama penelitian berkisar antara 266-70399 ind/m3. Bulan Juli berkisar antara 1333-30401ind/m3, bulan Oktober berkisar antara 399-12666ind/m3, bulan Desember berkisar antara 266-70399ind/m3 Pengelompokan stasiun berdasarkan parameter fisika-kimia selama penelitian menunjukkan bahwa pada tingkat kesamaan 85%, bulan Juli terdiri atas 4 kelompok, bulan Oktober 3 kelompok, dan bulan Desember 3 kelompok. sedangkan analisis pengelompokan stasiun berdasarkan parameter biologi pada tingkat kesamaan 60% pada bulan Juli terdiri atas 11 kelompok, bulan Oktober 11 kelompok, dan bulan Desember 8 kelompok.
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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