Judul: Struktur Komunitas Makrozoobentos di Perairan Sungai Banjaran dan Sungai Kranji Kabupaten Banyumas, Jawa Tengah
Abstrak: Sungai Banjaran dan Sungai Kranji merupakan sungai yang melintasi kota Purwokerto. Daerah ahan Sungai Banjaran dau Sungai Kranji yaitu melintasi daerah perladangan, sawah dan pemukiman penduduk. Setelah masuk Purwokerto, baik Sungai Banjaran maupun Sungai Kranji banyak dimanfaatkan untuk tempat pembuangan sampah dan limbah rumah tangga. Hal ini akan menyebabkan menurunnya kualitas perakan Suugai Banjaran dan Sungai Kranji. Penelitian ini bertujuan untuk mengetahui struktur komunitas makrozoobentos dan faktor-faktor lingkungn yaug mempengaruhi kehidupan organisme tersebut serta mengetahui organisme tertentu yang mungkin dapat dijadikan spesies indikator pada kondisi lingkungan (parameter) tertentu.
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Judul: Bioekologi komunitas ikan di sungai Banjaran Kabupaten Banyumas Jawa Tengah
Abstrak: Tujuan penelitian adalah untuk mengetahui aspek biologi ikan yaitu faktor kondisi, kebiasaan makanan yang dihubungkan dengan aspek ekologi ikan tersebut, distribusi spasial serta temporal dan keanekaragaman ikan. Selain itu juga melihat hubungan luas relung dan tumpang tindih habitat serta makanan antar spesies. Lokasi penelitian adalah di Sungai Banjaran, Kabupaten Banyumas, Propinsi Jawa Tengah dan dilaksanakan selama enam bulan, yaitu mulai bulan Juni sampai bulan November 1994. Dari hasil survai pendahuluan ditetapkan lima stasiun terpilih berdasarkan perbedaan kondisi habitat perairan yang akan diteliti. Stasiun I di Desa Ketenger, stasiun II di Desa Karangnangka, stasiun III di Desa Bobosan, stasiun IV di Desa Kober dan stasiun V di Desa Sidaboa. Dari hasil penelitian didapatkan 8 ordo, 14 famili dan 31 spesies ikan. Kelom- pok ikan didominasi oleh ordo Ostariophysi yang mempunyai penyebaran luas terdapat di semua stasiun pengamatan serta musim adalah Osteochilus hasselti, Rasbora lateristriata, Nemachilus fasciatus dan Glyptothorax platypogon. Pengelompokan habitat berdasarkan parameter fisik dan kimiawi perairan terlihat bahwa lima stasiun penelitian dapat dikelompokkan menjadi tiga kelompok. Kelompok pertama stasiun III dan IV dengan nilai kemiripan 89 %, kelompok kedua stasiun I dan II dengan nilai kemiripan 86 % dan kelompok ketiga adalah stasiun V dengan nilai ke- miripan 67 %. Stasiun V merupakan pertemuan antara Sungai Banjaran dengan Sungai Logawa…dst
Keyword: Biologi ikan, Spesies ikan, Kondisi habitat perairan, Ordo Ostariophysi

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