Judul: Telaah makrozzoobenthos sebagai indikator pencemaran air dan potensi makanan burung merandai di perairan Kota Baru Bandar Kemayoran, Jakarta
Abstrak: Penelitian mengenai pencemaran air serta potensi pakan burung merandai dilakukan di rawa dan waduk Kota Baru Bandar Kemayoran, Jakarta, pada bulan Mei dan Agustus 1994. Pengambilan contoh makrozoobenthos menggunakan metode purposive sampling yang terbagi dalam 7 stasiun sampling. Hasil penelitian menemukan 10 jenis makrozoobenthos yang dapat dikelompokkan dalam tiga filum, yaitu moluska, annelida dan arthopoda. Kelimpahan jenis didominasi oleh jenis Melanoides granifera dengan kelimpahan tertinggi ditemukan pada stasiun G (waduk), sedang kelimpahan di rawa mangrove sangat rendah. Nilai keragaman yang rendah (0,32 1,00) ditemukan pada perairan rawa mangrove, sehingga dapat dikatakan perairan ini telah mengalami tingkat pencemaran yang berat. Perairan waduk mempunyai nilai keragaman yang relatif lebih tinggi dari pada di rawa sehingga dapat dikatakan tingkat pencemaran pada perairan waduk adalah ringan. Nilai keseragaman pada perairan waduk menunjukkan adanya dominansi dari jenis tertentu, yaitu dari jenis Melanoides granifera, hal ini juga menunjukkan bahwa Komunitas benthos di habitat perairan tersebut mengalami gangguan (tercemar).
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Judul: Tingkat pencemaran perairan rawa mangrove, non mangrove dan waduk di hutan wisata Kota Baru Bandar Kemayoran (KBBK), Jakarta
Abstrak: Pembangunan kota sering dilihat hanya dari segi fisik kota. Pembangunan kota seringkali mengurangi Ruang Terbuka Hijau (RTH) banyak lahan yang bersifat alami dialihkan fungsinya menjadi perumahan/pemukiman, pertokoan, tempat hiburan dan industri. Hutan Wisata KBBK merupakan bagian dari ruang terbuka hijau yang dapat mendukung habitat burung. Perairan KBBK menerima masukan air yang mengandung limbah domestik dan industri, sehingga mencemari perairan. Kualitas air yang buruk mengakibatkan burung dan hewan air akan berpindah, cacat, mati dan kepunahan. Pentingnya peranan perairan Hutan Wisata KBBK bagi usaha perlindungan dan taman burung, maka kajian terhadap kualitas perairan tersebut untuk mendukung habitat burung perlu dilakukan. Penelitian ini bertujuan untuk mengetahui tingkat pencemaran perairan Hutan Wisata KBBK dan mengevaluasi tingkat kelayakan kualitas air bagi kehidupan fauna payau. Penelitian dilakukan berdasarkan pengambilan contoh pada tipe-tipe perairan di KBBK, yaitu Rawa Mangrove 1, Rawa Mangrove 2, Rawa Non Mangrove, Waduk, Drainase dan Sungai. Pengambilan contoh dilakukan dengan pengulangan 3 kali dan berselang 2 minggu (pagi dan sore) dengan metode "grab sampling" Parameter yang dikaji adalah BOD, DO, COD, amoniak, nitrat, nitrit, total fosfat, orto-fosfat, sulfida, sulfat, pH, padatan terlarut, padatan tersuspensi, warna, DHL, temperatur, kekeruhan salinitas dan logam kadmium.
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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