Judul: Upaya memperpanjang umur simpan tempe dengan metode pengeringan dan sterilisasi
Abstrak: Tempe merupakan makanan tradisional Indonesia yang dikonsumsi oleh hampir semua lapisan masyarakat. Tempe mengandung komponen-komponen gizi yang tinggi, seperti protein dan vitamin B12. Tempe juga diketahui mengandung senyawa antioksidan yang diidentifikasi sebagai isoflavon. Senyawa ini diyakini mempunyai peranan dalam meredam aktivitas radikal bebas, sehingga bermanfaat bagi pencegahan kanker seperti halnya karotenoid, vitamin E dan vitamin C. Tempe pada umumya mempunyai daya simpan yang relatif singkat. Penelitian ini bertujuan untuk memperpanjang umur simpan tempe sehingga jangkauan pendistribusiannya dapat lebih luas. Metode yang digunakan dalam penelitian ini adalah pengeringan dengan batch fluidized solar dryer, pengeringan dengan oven, dan sterilisasi.
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Judul: Mempelajari pengaruh blansir, sterilisasi komersial dan pengemasan terhadap umur simpan tempe
Abstrak: Tempe merupakan makanan tradisional yang populer di Indonesia. Tempe mengandung protein yang tinggi dengan harga yang relatif murah yang bisa dijangkau oleh berbagai tingkatan lapisan masyarakat. Tempe biasanya dibuat dari kacang kedelai. Tempe segar dapat disimpan selama dua hari sampai tiga hari pada suhu ruang dan setelah dua hari, tempe akan mengalami kerusakan dan penyimpangan baik aroma, tekstur, rasa, penampakan sehingga tidak dapat diterima lagi oleh konsumen. Dalam rangka memperpanjang umur simpan tempe sehingga tempe dapat disimpan dalam waktu yang lama pada suhu ruang sebelum dikonsumsi maka penelitian penyimpanan tempe dengan menggunakan kemasan plastik, sistem kemas vakum dan proses termal ini dilakukan
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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