Judul: Ekstraksi Dan Karakterisasi Pektin Dari Kulit Jeruk Lemon (citrus medica var lemon)
Abstrak: Dewasa ini kebutuhan zat pengental di industri pangan semakin meningkat sesuai dengan kebutuhan makanan yang semakin tinggi dan bervariasi (BPS, 2000). Peranan zat pengental sangat penting dalam mempengaruhi tekstur pangan, yang pada akhirnya akan berpengaruh pada pemilihan konsumen akan makanan. Pektin banyak digunakan pada industri makanan terutama produk jeli, selai, makaroni, makanan coklat, kembang gula dan industri minuman seperti produk susu dan pengalengan buah-buahan. Pektin yang bersifat multifungsi yang dalam industri nonpangan, yaitu dalam bidang farmasi untuk penyembuhan diare, menurunkan tingkat kolesterol darah, anemia, dan bahan kapsul obat-obatan (Towle dan Christensen, 1973).
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Judul: Pengaruh Jumlah Pengendap dan Alat Pengering Pada Proses Pembuatan Pektin Berbahan Baku Kulit Jeruk Manis
Abstrak: Jeruk merupakan salah satu komoditas perkebunan yang dapat dikonsumsi langsung atau diproses lagi menjadi produk pangan, seperti minuman sari buah. Sekitar 70% dan bagian buah jeruk merupakan limbah yang belum digunakan, padahal bagian tersebut (kulit, pulp, dan kulit ari) memiliki kandungan senyawa yang dapat digunakan untuk keperluan lain seperti pektin, senyawa volatil dan lain-lain. Pemanfaatan kulit jeruk juga merupakan salah satu usaha meningkatkan nilai tambah dari jeruk. Pektin merupakan zat pengental yang banyak digunakan pada industri baik pangan maupun non pangan. Kemampuannya membuat gel menjadikan pektin sebagai salah satu bahan tambahan makanan yang penting pada industri selai, jelly dan kembang gula. Seiring dengan kegunaan pektin yang semakin banyak, kebutuhan pektin dalam industri juga akan bertambah. Pada tahun 1998, jumlah impor pektin Indonesia untuk kebutuhan pangan mencapai 1.095 ton yang bernilai US$ 5.2 juta (BPS, 2000).
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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