Judul: Analisis Perilaku Konsumen di Kota Bogor terhadap Produk Deterjen
Abstrak: Kebutuhan akan produk sabun cuci pakaian (deterjen) telah menjadi kebutuhan pokok bagi sebagian besar masyarakat sehingga menjadi 'ladang empuk' bagi para produsen untuk memproduksi dan menjual kebutuhan tersebut. Dalam ha1 ini, para produsen deterjen tersebut berlomba-lomba untuk menarik minat masyarakat sebagai konsumen agar memilih produknya dengan berbagai macam cara. Ada sebagian produk yang menonjolkan sisi inovasi dan teknologi produksinya. Namun ada pula merek lain yang lebih menonjolkan atribut di luar core product, misalnya hadiah. Perkembangan industri deterjen . juga mempengaruhi perubahan perilaku konsumen, karena konsumen dihadapkan pada berbagai pilihan baik pilihan mutu, kuantitas maupun atribut lainnya seperti harga, hadiah dan sebagainya. Hal inilah yang melatarbelakangi untuk meneliti perilaku konsumen terhadap produk deterjen.
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Judul: Perilaku konsumen dalam proses keputusan pembelian produk agar-agar di Market Place Matahari di Kota Bogor
Abstrak: Jumlah penjualan produk akan mempengaruhi keuntungan yang diperoleh suatu perusahaan. Untuk mencapai tingkat penjualan yang diinginkan, produsen produk agar-agar harus mengetahui bagaimana perilaku konsumen produk agaragar. Penelitian ini bertujuan untuk mengetahui dan menganalisis karakteristik umum konsumen, perilaku konsumen dalam proses keputusan pembelian serta faktor-faktor yang mempengaruhi proses keputusan pembelian produk agar-agar. Metode penelitian yang digunakan dalam penelitian ini adalah studi kasus dengan satuan kasus adalah konsumen produk agar-agar di Market Place Matahari di kota Bogor. Pengambilan sampel purpossive sampling digunakan untuk memilih Market Place Matahari di kota Bogor sebagai lokasi penelitian, sedangkan pengambilan sampel accidental sampling digunakan untuk memilih responden. Metode analisis data yang digunakan adalah analisis data deskriptif, analisis cochran Q test dan analisis index value.
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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