Judul: Persepsi Mahasiswa Terhadap Mutu Siaran Agri FM
Abstrak: Radio merupakan sebuah sarana media massa yang memiliki beberapa kelebihan. Diantaranya, memiliki biaya operasional yang lebih murah, lebih cepat dalam penyebarluasan informasi. Radio menjadi sumber kehidupan yang kompleks, mulai dari fungsi "tradisional" radio sebagai penyampai berita dan informasi, sentra ekonomi, pendongkrak popularitas dan karier, hingga sebagai propaganda politik dan ideologi(Masduki, 2004).
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Judul: Analysis of the factors that importance of the listener of Agriculture Radio Ciawi in the case of the Ciherang Village Subdistrict
Abstrak: Media massa memiliki peran besar dalam menyebarkan informasi dan hiburan yang dibutuhkan masyarakat. Salah satu media massa yang sampai sekarang tetap menarik dan dimanfaatkan banyak orang untuk mendapatkan informasi adalah radio. Di era multimedia saat ini, peminat radio semakin berkurang. Padahal radio merupakan media yang punya rekam jejak yang menakjubkan. Namun kini perannya seolah tenggelam oleh kehadiran media televisi, internet, hingga telepon selular. Menuurut MARS Indonesia melakukan survei di 8 kota, yaitu Jakarta, Bandung, Semarang, Surabaya, Medan, Makassar, Balikpapan, dan Palembang yang termuat dalam “Perilaku Belanja Konsumen Indonesia 2009” menunjukkan jumlah pendengar radio secara total masih sekitar 37%. Munculnya radio-radio baru di Indonesia menimbulkan persaingan yang ketat diantara radio. Setiap radio berlomba-lomba menciptakan dan menawarkan program acara yang menarik dan unggul dibandingkan radio lainya. Radio Pertanian Ciawi atau lebih dikenal dengan RPC merupakan salah satu radio pertanian yang menyajikan program-program siaran radio bernuansakan pertanian dan pedesaan. RPC merupakan radio yang didirikan dibawah Departemen Pertanian Republik Indonesia (DEPTAN RI). RPC berada pada frekuensi FM 95,3 dan AM 846.
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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