Judul: Analisis permintaan obyek wisata arung jeram sungai citarik, di Kecamatan Cikidang, Kabupaten Sukabumi, Provinsi Jawa Barat
Abstrak: Potensi sungai tidak saja menghasilkan komoditas yang dapat tangsung dikonsumsi manusia seperti ikan akan tetapi dapat menghasilkan jasa lingkungan yang dapat dinikmati oleh manusia dalam bentuk wisata. Berdasarkan hasil penelitian diketahui bahwa atraksi wisata yang terdapat obyek wisata Sungai Citarik ialah arung jeram denga njasa wisata yang menawarkan berupa beberapa paket wisata arung jeram, jasa penginapan dengan nama Nusa Traditional Cottage, rumah makan dan jasa penunjang lainnya. Angkutan wisata yang dapat digunakan menuju tempat obyek wisata Sungai Citarik bisa berupa kendaraan umum maupun dengan menggunakan kendaraan pribadi.
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Judul: Perencanaan Lanskap Kawasan Rekreasi Arung Jeram Sungai Citarik, Sukabumi
Abstrak: Untuk memenuhi kebutuhan masyarakat perkotaan akan rekreasi, Sukabumi sebagai kabupaten yang memiliki akses yang mudah dari dan menuju ke pusat-pusat komunitas seperti wilayah Jabotabek dan Bandung, menawarkan beberapa kawasan rekreasi alternatif, diantaranya adalah rekreasi alam Suangai Citarik. Sungai Citarik mempunyai potensi yang sangat besar sebagai salah satu daerah tujuan rekreasi alam dan rekreasi petualangan arung jeram. Pengembangan kawasan rekreasi arung jeram Sungai Citarik ini memiliki beberapa kepentingan, baik kepentingan industri pariwisata daerah, perekonomian penduduk setempat maupun kelestarian lingkungan alam sekitarnya. Untuk dapat mengakomodasikan kepentingan-kepentingan tersebut di atas, maka diperlukan suatu perencanaan lanskap perencanaan kawasan rekreasi yang baik.
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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