Judul: Studi Kebiasaan Makanan lkan-ikan yang Tertangkap disekitar Ekosistem Mangrove Pantai Oesapa dan Oebelo Teluk Kupang - Nusa Tenggara timur
Abstrak: Penelitian ini bertujuan uniuk mengetahui keterkaitan antara faktor fisik-kimia dan bioiogi perairan dsngan kelimpahan plankton sebagai makanan alami dalam hubungannya dengan kebksaan makanan ikan-ikan yang terdapat di ekasistem mangrove berdasarkan aktivitas hariannya (diumal maupun noktumal). Fluktuasi parameter fisika-kimia perairan disemua stasiun selama 4 periade pengamatan tidak menunjukkan lonjakan yang berarti kecuafi salinitas dan pH.
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Judul: Keanekaragaman Jenis Ikan dan Makanan Beberapa Ikan Ekonomis Penting di Perairan Pantai Kupang, Lubuk Damar, Aceh Tamiang
Abstrak: Perairan Pantai Kupang merupakan suatu perairan yang terletak di Kecamatan Seruway, Desa Lubuk Damar, Kecamatan Aceh Tamiang. Perairan ini memiliki kondisi ekosistem mangrove yang mengalami penurunan luasan mangrove akibat alih fungsi lahan. Tujuan penelitian ini adalah bertujuan untuk menelaah tingkat keanekaragaman ikan dan menelaah makanan beberapa ikan ekonomis penting di pantai tersebut. Pengambilan contoh ikan dilakukan pada waktu siang dan malam hari dengan menggunakan 2 macam gill net yang berbeda ukuran mata jaring yakni 1,5 inci dan 2 inci. Analisis kebiasaan makan ikan ekonomis penting dengan menggunakan indeks proporsi. Hasil yang diperoleh dari penelitian ini yakni jenis ikan sebanyak 21 jenis dengan 17 famili. Selain itu, hasil analisis komposisi makanan dari ikan ekonomis penting yang dianalisis menunjukkan lebih dari 70% berisi krustasea terutama dari jenis udang–udangan. Hal ini berarti udang merupakan salah satu sumber makanan utama dari bagi beberapa komunitas ikan yang ada di perairan tersebut.
Keyword: diversitas ikan, kebiasaan makanan, degredasi lingkungan

Judul: The Construction of Greedy SVP LLL Algorithm
Abstrak: A lattice is a set of all integer linear combination of a set of linearly independent vectors in ℝ𝑛���. The independent vectors are called bases of lattice. Any lattice can be generated from many bases, and these bases have the same cardinality. In the lattice, the most fundamental and renowned problem is the Shortest Vector Problem (SVP). SVP is a tracking problem of the shortest nonzero vector in a lattice with equivalent bases. In two dimensions, SVP problem has resolved exactly by Gauss’ algorithm. When the lattice dimension is higher than two, A.K. Lenstra, H.W. Lenstra and L. Lovasz gave a LLL algorithm to compute approximation of nonzero shortest vector in the lattice. Reduced bases solution obtained from LLL algorithm still be an approximation and has polynomial running time of arbitrary dimension which large enough. In 1994, Schnoor and Euchner modified this LLL algorithm as a new variant which later was named deep insertion LLL algorithm. This algorithm is a modified version of the LLL algorithm to the terms of the exchange step to improve the accuracy of output of LLL reduced bases and applying it to the subset sum problem. The purpose of this research are: (1) Reconstruct the LLL algorithm and deep insertion LLL algorithm using a geometric approach. (2) Construct a greedy SVP LLL algorithm. (3) Implement the three algorithms in a symbolic programming language, and evaluate them experimentally. A bases ℬ=[𝐛���1,𝐛���2,…,𝐛���𝑛���] in ℝ𝑚��� is called reduced LLL with parameter 𝛿��� if satisfies: (a) |𝜇���𝑗���𝑖���|≤12, for every integer 𝑖���,𝑗��� with 1≤𝑖���<𝑗���<𝑛���. (b)𝛿���‖𝜋���𝑗���(𝐛���𝑗���)‖2≤‖𝜋���𝑗���(𝐛���𝑗���+1)‖2, for 𝑗���=1,2,…,𝑛���−1,where 𝛿��� is a reduced parameter of real numbers with 14<𝛿���<1. The first requirement is the reduced basis 𝛿��� must “nearly orthogonal” and in its computation case, this requirement can be reached out by using the Gram-Schmidt’s orthogonalization. While the second requirement is called exchange step, or used to called as Lovasz condition. By using both of these requirements, then they establish the LLL algorithm. Then, Schnoor and Euchner modify the LLL algorithm based on the requirements of the exchange step called the deep insertion LLL algorithm, where the exchange step is based on the comparison of the projected vector in orthogonal complement [𝐛���1,𝐛���2,…,𝐛���𝑘���−1]⊥ after j-th reduction. To construct greedy SVP LLL algorithm, the requirements of the exchange step is based on purely by comparing norm of lattice 𝐛���𝑗��� with norm lattice 𝐛���𝑖��� for 𝑖���=1,2,3…,𝑗���−1. The process of insertion reduced vector after the exchange step also has done greedily. Then, we calculate the number of arithmetic operation in greedy SVP LLL algorithm for further analysis. The result of our exprimentation for three algorithms on the certain matrix size shows that the running time of the three algorithms increases propotional to the size of the matrix. The result also shows that by using 𝛿���=34 for the LLL algorithm and the deep insertion LLL algorithm, and the greedy SVP LLL algorithm which is a new variant made by using no parameter of 𝛿���, outperform of the other of two previous algorithm in terms of speed with the same output.
Keyword: LLL algorithm, LLL deep insertion algorithm, greedy SVP LLL algorithm