Judul: Dedi Kusuma Wardana
Abstrak: Koksidiosis merupakan salah satu penyakit yang disebabkan protozoa dari genus Eimeria yang mengakibatkan kerugian bagi peternakan ayam. Kerugian akibat koksidiosis antara lain mortalitas, morbiditas, penurunan berat badan, pertumbuhan terhambat, efisiensi pakan menurun, terlambatnya masa produksi telur, biaya pengobatan tinggi, dan penurunan produksi (Tampubolon 1996). Eimeria spp memperbanyak diri di saluran pencernaan sehingga mampu merusak jaringan usus yang menyebabkan enteritis dan diare bahkan diare berdarah, ayam menjadi lemah, pucat, bulu kusam dan malas (Tabbu 2002).
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Judul: Koksidiosis unsur halus pada ayam yang disebabkan oleh infeksi eimeria maxima
Abstrak: Eimeria maxima, suatu jenis protozoa yang ditemukan pertama kali oleh Tyzzer pada tahun 1929, merupakan salah satu penyebab koksidiasis usus halus pada ayam. Di bawah mikroskop, ookista Eimeria maxima yang telah bersporulasi terlihat berbentuk bulat telur dengan ukuran yang besar, berdinding tebal dan kasar, tetapi tidak mempunyai mikropil. Siklus hidupnya terjadi di luar dan di dalam tubuh ayam, tetapi tidak memoutuhkan induk semang antara, sehingga mudah tersebar ke mana-mana. Walaupun angka kematian yang ditimbulkan oleh infeksi jenis Eimeria ini tidak begitu tinggi, tetapi cukup merugikan peternak karena dapat menurunkan produksi telur dan daging serta menaikkan nilai konversi makanan. Selain itu infeksi Eimeria maxima dapat menjadi pemula terjadinya infeksi sekunder, baik oleh jenis Eimeria maupun oleh agens penyakit lainnya. Gejala klinis yang dapat diamati, yaitu penderita nampak murung, kurang nafsu makan, agak pucat, produksi menurun, diare berwarna kemerahan dan kadang-kadang bisa terjadi kematian. Pemeriksaan patologi-anatomi akan memperlihatkan perubahan pada usus halus berupa penebalan dan penggembungan usus disertai tinja berwarna kemerahan di dalamnya. ...
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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