Judul: Kajian Stok Sumberdaya Ikan Tembang (Sardinella fimbriata Valenciennes, 1847) di Perairan Teluk Banten yang Didaratkan di PPN Karangantu, Banten
Abstrak: Sardinella fimbriata atau fringescale sardine atau ikan tembang menjadi salah satu sumberdaya ikan yang dimanfaatkan. Hasil tangkapan ikan tembang di PPN Karangantu, Banten menurun dari tahun ke tahun. Oleh karena itu diduga ikan tembang di perairan Teluk Banten telah mengalami eksploitasi berlebih. Tujuan penelitian ini adalah untuk mengetahui status ikan tembang melalui beberapa parameter dinamika populasi ikan agar dapat dijadikan pertimbangan dalam pengelolaan sumberdaya ikan tembang. Pola pertumbuhan ikan tembang di Teluk Banten bersifat allometrik positif. Hasil pemisahan kelompok umur menggunakan metode NORMSEP menunjukkan ikan tembang terdiri dari dua kelompok umur dengan L∞189.0675 mm untuk ikan betina dan 191.6537 mm untuk ikan jantan. Laju eksploitasi (E) mengindikasikan bahwa sumberdaya ikan tembang telah mengalami eksploitasi berlebih. Dugaan pertama kali ikan tembang matang gonad adalah 161 mm. Informasi ini dapat di jadikan dasar alternatif pengelolaan yakni pengaturan penangkapan yang ukurannya lebih dari 161 mm agar ikan-ikan tersebut dapat memijah setidaknya satu kali agar lestari dan berkelanjutan.
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Judul: Kajian Stok Sumber Daya Ikan Tembang (Sardinella Fimbriata Valenciennes, 1847) Di Perairan Selat Sunda
Abstrak: Ikan tembang (Sardinella fimbriata) merupakan ikan pelagis kecil yang memiliki nilai ekonomis penting di perairan Selat Sunda dan merupakan salah satu ikan tangkapan dominan yang didaratkan di Pelabuhan Perikanan Pantai (PPP) Labuan, Banten. Tingginya permintaan masyarakat mengakibatkan peningkatan penangkapan. Tujuan penelitian ini adalah untuk mengkaji kondisi stok ikan tembang di Perairan Selat Sunda. Penelitian dilakukan pada bulan Juni-Oktober 2014. Analisis data terdiri atas: hubungan panjang bobot, parameter pertumbuhan, laju ekspoitasi, dan model produksi surplus. Pola pertumbuhan ikan tembang betina dan jantan masing-masing adalah allometrik positif dan isometrik. Ukuran pertama kali matang gonad (Lm) ikan tembang betina dan jantan masing-masing sebesar 155,84 mm dan 143,42 mm. Panjang tubuh asimptotik (L∞) ikan tembang betina dan jantan masing-masing 190,58 mm dan 169,98 mm. Upaya optimum menggunakan model Fox menunjukkan nilai sebesar 2840 trip/tahun dengan hasil tangkapan maksimum lestari 3436,87 ton/tahun dan jumlah tangkapan yang diperbolehkan 2474,52 ton/tahun. Laju eksploitasi ikan tembang telah melebihi 50% artinya ikan tembang di Selat Sunda diduga telah mengalami tangkap lebih.
Keyword: Ikan tembang, laju eksploitasi, pertumbuhan, tangkapan maksimum lestari, PPP Labuan

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