Judul: Mempelajari Metode Reduksi Kadar Histamin dalam pembuatan Pindang Tongkol
Abstrak: Pemindangan merupakan salah satu bentuk olahan ikan secara tradisional yang cukup populer di Indonesia. Hal ini disebabkan karena ikan pindang mempunyai citarasa yang spesifik sehingga dapat diterima oleh masyarakat Indonesia. Masalah yang dihadapi dalam pembuatan ikan pindang adalah terbentuknya suatu senyawa yang dapat menyebabkan keracunan yaitu biogenik amin akibat sanitasi yang buruk selama pengolahan maupun penyimpanan.
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Judul: Pengawetan Pindang Ikan Kembung (Rastrelliger sp) dengan Aplikasi Kombinasi Natrium Asetat, NAtrium Klorida, Bakteri Asam Laktat dan Pengemasan Vakum
Abstrak: Pemindangan merupakan salah satu cara pengolahan sekaligus pengawetan ikan yang cukup populer di Indonesia. Umumnya pernindarigan secara tradisional dilakukan dengan merebus ikan dalam larutan garam selama jangka waktu tertentu dalam wadah paso tanah liat, badeng atau drum-drum bekas. Pengolahan ikan pindang secara tradisional biasanya kurang memperhatikan aspek sanitasi dm higiene sehingga menyebabkan rendahnya mutu simpan dan keamanan ikan pindang. Ikan pindang yang ada di pasaran, biasanya hanya berumur simpan 1-3 hari. Penelitian ini bertujuan untuk meningkatkan mutu simpan dan keamanan pindang ikan kembung (Rastrelliger sp) rendab garam dengan aplikasi ko~nbinasi natrium asetat, natrium klorida, bakteri asam laktat dan pengemasan vakum pada penyimpanan suliu kamar. Penelitian terbagi merljadi tiga tahap, yaitu (1) seleksi isolat bakteri asam laktat Lactobacillzis planinrzm~ terunggul (2) penelltuan konsentrasi garam natrium klorida (NaCl) dan natrium asetat (NaAs) dan (3) studi mutu simpan pindang ikan kembung pada suhu kamar.
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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