Judul: Honey as natural antioxidant to prevent meat cooking rancidity during storage at 4 degrees celcius
Abstrak: Honey is a source of carbohydrate, which is very useful for body health becouse it contains simple sugar that can be easily absorbed. Honney is used on health beverage industries, cosmetic and pharmacology. Greek people has used honey as meat preservative, so it can be stored for a long time. Meat contains lipid that can be easily oxidated to possibly cause off flavor and taste, knoen as rancidity. Rancidity is one of parameters in food quality. Rancidity occurs becouse of oxidation, hydrolysis, enzyme’s activities and microorganism activities. Antioxidant can be used as rancidity prevention.
Keyword: Madu, daging, ketengikan, antioksidan, nilai thiobarbituric acid (TBA)

Judul: Umur Simpan, Aktivitas Antioksidan dan Keamanan Minuman Madu-Galohgor
Abstrak: The objective of this research was to analyze stability, shelf life and antioxidant activity during storage of Honey-Galohgor beverage. Temperature storage was 10°C and 25°C for two months and samples were analyzed every two weeks (0, 2nd,4th,6th and 8th week). The analysis consisted of organoleptic test (color, aroma, and taste), physical characteristic (viscosity), chemical characteristics (pH and Total Acid Titration-TAT), antioxidant activity, and total plate count of microbes (TPC). Shelf life of Honey-Galohgor beverage was determined by Arrhenius equation. The results showed that viscosity, pH, and TPC were increased, meanwhile TAT and antioxidant activity decreased during storage. Storage temperature influence (p<0.05) viscocity, antioxidant activity, and TPC. Storage period influence (p<0.05) viscosity, pH, TAT, antioxidant activity, and microbe content. Shelf life of Honey-Galohgor beverage was one year at room temperature (25°C).
Keyword: 

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