Judul: Analisis Dampak Kegiatan Tambak Udang Terhadap Kualitas Air Dan Komunitas Makrozoobentos Di Wilayah Pesisir Pangumbahan Kabupaten Sukabumi
Abstrak: Penelitian ini dilaksanakan di kawasan pesisir Pangumbahan Kabupaten Sukabumi pada Bulan Agustus sampai Desember 1995. Tujuan penelitian ini adalah (1) mengetahui beban pencemaran dari kegiatan tambak,(2) menganalisis pengaruh kegiatan tambak terhadap status lingkungan perairan pesisir dilihat dari komponen fisika-kimia perairan dan komunitas makrozoobentos, (3) mengetahui distribusi spasial air buangan tambak dan makrozoobentos. Dalam penelitian ini ditetapkan 10 stasiun pengambilan contoh. Penetapan stasiun pada perairan pesisir didasarkan atas kondisi fisik lokasi penelitian dan kemungkinan penyebaran limbah. Pengambilan dan pengukuran contoh air dilakukan sebanyak tiga kali ulangan dengan interval waktu selama satu bulan. Parameter fisika-kimia perairan yang diukur meliputi: suhu, kecepatan dan arah arus, kekeruhan, kecerahan, kedalaman, padatan tersuspensi (MPT), pH, salinitas, BOT, COD, BOD5, oksigen terlarut (DO), nitrat, nitrit, amonia dan fosfat total. Komponen biologis yang dianalisis adalah komunitas makrozoobentos melalui perhitungan kelimpahan, keanekaragaman, keseragaman dan dominansi jenis. Distribusi spasial makrozoobentos dalam hubungannya dengan karakteristik habitat dianalisis dengan Analisis Faktorial Koresponden (Corespondent Factorial Analysis). Konfirmasi dari Analisis Komponen utama dan Analisis Faktorial Koresponden dilakukan melalui klasifikasi hierarki yang diwujudkan dalam bentuk dendogram. Beban pencemaran kegiatan tambak terhadap perairan pesisir dihitung berdasarkan parameter MPT, COD, BOD5 dan NH3. Hasil pengamatan menun- jukkan bahwa kegiatan tambak udang PT Bumi Lestari Abadi (BLA) memberikan kontribusi akumulatif beban pencemaran berdasarkan parameter BOD5 sebesar 9 788.68 kg/bulan, COD sebesar 19 611.07 kg/bulan, NH3 sebesar 92. 664 kg/bulan dan MPT sebesar 123 832.8 kg/bulan…dst
Keyword: Tambak Udang, Komunitas Makrozoobentos, Ekosistem Pesisir, Pencemaran Perairan Pesisir, Kualitasnya

Judul: Pengaruh limbah organik tambak udang intensif terhadap kualitas lingkungan perairan pesisir: studi kasus pada PT Tambak Inti Rakyat, Karawang
Abstrak: Penelitian ini dilaksanakan di lingkungan perairan Pertambakan PP Tambak Inti Rakyat, Karawang pada akhir Maret sampai akhir Juni 1994. Tujuan Penelitian ini adalah untuk : (1) mengetahui tingkat pencemaran yang ditimbulkan kegiatan tambak udang intensif terhadap lingkungan perairan pesisir ; (2) mengetahui perbedaan kualitas air masuk dan air buangan suatu kegiatan pertambakan intensif; serta (3) mengetahui besarnya beban limbah bahan organik dari tambak udang intensif yang terbuang ke lingkungan perairan pesisir. Hasil penelitian ini menunjukkan terjadinya pencemaran limbah organik pada lingkungan perairan pesisir akibat aktivitas tambak udang intensif. Hal ini ditunjang dari hasil pengukuran Kekeruhan, TSS, COD dan nitrit air buangan yang telah melampaui ambang batas Baku Mutu Air Laut Untuk Biota Laut (Kep-02/MENKLH/I/1988). Berdasarkan Indeks Mutu Lingkungan Perairan NSF-WQI diperoleh kisaran 53,49-66,44 dengan kriteria perairan tercemar sedang. Fitoplankton di lingkungan perairan pesisir PP TIR, Karawang menunjukkan kisaran nilai indeks keragaman 1,66 - 2,19 dan indeks keseragaman 0,59 - 0,87. ...
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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