Judul: Hubungan Perilaku Komunikasi dengan Pemahaman Petani terhadap Fungsi Radio Komunitas (Kasus Radio Komunitas Petani Trisna Alami Desa Kaliagung, Kecamatan Sentolo, Kabupaten Kulon Progo, Provinsi D.I Yogyakarta)
Abstrak: Tujuan dari penelitian ini adalah untuk mengetahui dan menganalisis hubungan perilaku komunikasi dengan pemahaman petani terhadap fungsi radio komunitas, yaitu sebagai komunikasi internal, sarana pendidikan umum dan agama, serta ruang publik. Penelitian ini didesain sebagai penelitian survai dengan tipe explanatory research. Penelitian ini dilaksanakan pada bulan Maret hingga April 2011 di Desa Kaliagung. Pengambilan sampel dalam penelitian ini dilakukan dengan cara pengambilan sampel acak sederhana. Kemudian dibuatlah daftar nama seluruh anggota kelompok tani pendengar radio komunitas yang terpilih itu. Dari kerangka sampling tersebut, sampel yang akan dipilih dilakukan dengan menggunakan pola pengundian. Pemilihan petani dalam penelitian menggunakan Rumus Slovin sebanyak 40 petani. Data yang dikumpulkan dalam penelitian ini terdiri dari data primer dan sekunder. Data penelitian dianalisis dengan prosedur analisis statistik deskriptif dan pengukuran hubungan menggunakan software SPSS 17.0. Hubungan perilaku komunikasi dengan pemahaman petani terhadap fungsi radio komunitas diuji dengan menggunakan prosedur chi square dengan α = 0,05 dan α = 0,1. Perilaku komunikasi adalah aktivitas yang dilakukan oleh petani dalam mencari dan memperoleh sumber informasi mengenai Radio Komunitas Petani Trisna Alami dan fungsinya dalam kehidupan sehari-hari. Peubah perilaku kekosmopolitan, frekuensi bertemu penyuluh, keterdedahan media massa lain, serta keterdedahan dengan Radio Komunitas Petani Trisna Alami. Tingkat pemahaman petani merupakan proses belajar dan berfikir. Perilaku komunikasi yang tinggi akan meningkatkan pemahaman petani terhadap fungsi komunikasi internal, sarana pendidikan umum dan agama, serta ruang publik yang tinggi pula. Hasil penelitian menunjukkan perilaku komunikasi yang berhubungan secara nyata dengan pemahaman fungsi komunikasi internal adalah kekosmopolitan, frekuensi mendengarkan selain radio komunitas, dan keterdedahan dengan Radio Komunitas Petani Trisna Alami, sedangkan tingkat partisipasi sosial, keterdedahan saluran komunikasi interpersonal, frekuensi bertemu penyuluh, dan tingkat keterdedahan media massa yang meliputi frekuensi dan lama menonton televisi, frekuensi dan lama membaca koran, serta lama mendengarkan selain radio komunitas tidak mempunyai hubungan yang nyata dengan pemahaman fungsi komunikasi internal. Keterdedahan saluran komunikasi interpersonal dan keterdedahan dengan Radio Komunitas Petani Trisna Alami berhubungan secara nyata dengan pemahaman fungsi sarana pendidikan umum dan agama. Demikian pula frekuensi menonton televisi mempunyai hubungan yang nyata dengan pemahaman fungsi sarana pendidikan umum dan agama. Peubah perilaku komunikasi yang berhubungan nyata dengan pemahaman fungsi ruang publik adalah lama menonton televisi, frekuensi membaca koran, serta keterdedahan dengan Radio Komunitas Petani Trisna Alami.
Keyword: community radio, communication behavior, functions of community radio

Judul: Hubungan Perilaku Komunikasi dengan Pemahaman Petani terhadap Fungsi Radio Komunitas (Kasus Radio Komunitas Petani Trisna Alami Desa Kaliagung, Kecamatan Sentolo, Kabupaten Kulon Progo, Provinsi D.I Yogyakarta).
Abstrak: Community radio plays role as advocate of social change at the community level. “Trisna Alami” community radio was one kind of radio-based or sector-specific issues, that was built by a community from the same interests about agricultural issues. Typology of Trisna Alami community radio listeners consist of the selective and a passive listener. Trisna Alami community radio broadcasted agricultural information and entertainment. The functions of community radio are not only as an entertainer and educators, but also as community empowerment. Communication behavior in this research were: interpersonal channels exposure, cosmopoliteness, contact with extension agent, the other mass media exposure, and community radio exposure. The purposes of this research were to investigate and analyze the relationship between communication behaviors and farmers understanding of the community radio’s function. The research was designed by explanatory type. The sample in this research has done by simple random sampling. The total respondents were 40 persons. Respondents was chosen by judgement sampling. Techniques of data collection were using questionnaires, interviews, and observation. The result of this research showed that community radio’s exposure consist of frequency and duration of Trisna Alami Community Radio listened connected with farmer’s understanding the functions of community radio such as: an internal communication, public education and religious facilities, and also public sphere. The indicators of communication behaviors were not all connected with the third function of community radio.
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