Judul: Kondisi Ekologis Situ Pondok, Kecamatan Pasar Kemis, Kabupaten Tanggerang, Banten (Suatu Kajian Bagi Pengelolaan Situ Dimasa Mandatang)
Abstrak: Situ Pondok terletak di kampung Pondok, Desa Sukaharja, Kecamatan Pasar Kemis, Kabupaten Tangerang, Banten. Situ Pondok memiliki batas wilayah yang terdiri dari terminal Pasar Kemis di bagian utara, kampung dan pemukiman di bagian selatan dan barat, serta jalan raya di bagian timur. Pada awalnya (sebelum tahun 1990-1991) Situ Pondok memiliki luas 27,7 hektar dengan daya tampung situ sebanyak 540.000 m3 (Departemen PU), narnun sekarang luas Situ Pondok diperkirakan tinggal sepertiganya dari luas awal. Hal ini diakibatkan karena adanya konversi laban Situ Pondok. Penelitian kondisi ekologis Situ Pondok dilakukan antara bulan Mei sampai Agustus 2002 meliputi kualitas fisika kimia perairan, komponen biota perairan. serta biota darat. Komponen biota perairan yang diamati dan dikaji meliputi plankton, bentos, perifiton, ikan dan tumbuhan air. Sedangkan komponen biota darat meliputi mamalia, insekta, reptil, burung, dan tumbuhan tepi Situ Pondok. Untuk pengambilan sampel biota perairan dan parameter fisika kimia, Situ Pondok dibagi menjadi enam stasiun yang penentuannya menggunakan metode sistematik (melihat daerah-daerah khusus). Sedangkan untuk memperoleh informasi mengenai biota tepi Situ Pondok dilakukan dengan metode wawancara.
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Judul: Kajian Ekologi Situ Citayam, Depok Jawa Barat dalam Upaya Pelestarian dan Peningkatan Fungsi Situ
Abstrak: Situ or lake is one of tl~ep otential wetland that could be developed by natural or man made.Natunl situ need more intensive treatment, in order tlle function and the potency of situ will not lost.This research is done by studying the ecological condition of Situ Citayam freshwater. The study focused on the general condition of freshwater. Water quality analyzed by physical, chemical, and biological parameter. The abundance and, diversity of plankton were analyzed by Shannon Wiener diversity index (H'). Nitrogen and phospoms ratio was counted to get the main limited factor of water organism growth, and double linier regression analysis to know the relation of physical, chemical, and biological parameter. Physical and chemical of water quality showed tllat the condition of freshwater has been polluted in middle range. It caused by domestically waste water and soil erotion which causing superficial in some region. The indicator of the middle polluted level Situ Citayam is guessed from the mesosaprobic organism which found out, it consists of Brachionus, Oscillatoria, ~Melosira. Scenedesn~ us, Pediastrunr, Vorticella, and Spirogym. All the matters supported by index diversity of Shannon Wier in range between 1,12 to 1,30. Nitrogen and pl~osporus ratio counted show that the main limited factor of water organism growth in the situ was phosporus. The result of double linier regression analysis described a very close relation between the physical. chemical, and the biological parameter as well.
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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