Judul: The Contribution of Ecotourism of Petengoran Mangrove Forest to the Income of the Gebang Village Community
Abstrak: Berbagai tipe hutan memiliki potensinya masing-masing seperti halnya hutan mangrove yang berpotensi menjadi ekowisata guna memberikan manfaat ekonomi bagi masyarakat sekitar. Penelitian ini bertujuan menganalisis kontribusi Ekowisata Hutan Mangrove Petengoran terhadap pendapatan masyarakat, menganalisis persepsi pengunjung ekowisata serta mengidentifikasi tingkat kesejahteraan rumah tangga masyarakat pengelola ekowisata. Pengumpulan data dilakukan dengan wawancara terhadap 28 responden masyarakat yang menjadi pengelola ekowisata dan 30 pengunjung ekowisata serta studi pustaka. Hasil penelitian menunjukkan kontribusi ekowisata terhadap pendapatan total rata-rata rumah tangga masyarakat sebesar 32,04%, mayoritas pengunjung merasa puas dengan fasilitas, pengelolaan dan harga tiket masuk ekowisata dan kesejahteraan masyarakat pengelola berada pada tingkat cukup hidup layak., Various types of forests have their own potential, such as mangrove forests which have the potential to become ecotourism in order to provide economic benefits for the surrounding community. Data were collected by interviews to 28 respondents which are ecotourism management communities and 30 visitors as well as literature study. The results showed that the contribution of ecotourism to the average total income of the community's household was 32.04%, and the majority of visitors were satisfied with the facilities, management, and ticket prices for ecotourism and the welfare of the managing community was at a decent level of living.
Keyword: Kontribusi, Kesejahteraan, Hutan Mangrove, Ekowisata

Judul: Contribution of Sunge Jingkem Mangrove Forest Ecotourism to the Income of the Samudra Jaya Village Community, Bekasi Regency
Abstrak: ABSTRAK FEBY DIMAS PERDANA. Kontribusi Ekowisata Hutan Mangrove Sunge Jingkem Terhadap Pendapatan Masyarakat Desa Samudra Jaya Kabupaten Bekasi. Dibimbing oleh LETI SUNDAWATI. Ekosistem mangrove memiliki banyak manfaat langsung bagi manusia berupa produk ataupun jasa antara lain dapat menyediakan pangan dan objek wisata alam, pemanfaatan jasa ekosistem berupa ekowisata akan mendorong upaya konservasi ekosistem mangrove. Penelitian ini bertujuan untuk mengidentifikasi karakteristik masyarakat yang terlibat dalam pengelolaan Ekowisata Hutan Mangrove Sunge Jingkem, menganalisis kontribusi Ekowisata Hutan Mangrove Sunge Jingkem terhadap pendapatan masyarakat serta mengidentifikasi tingkat kesejahteraan rumah tangga masyarakat pengelola ekowisata. Pengumpulan data primer dilakukan dengan wawancara kepada masyarakat pengelola Ekowisata Hutan Mangrove Sunge Jingkem sebanyak 35 orang serta melalui studi pustaka. Hasil penelitian menunjukkan bahwa kontribusi ekowisata terhadap pendapatan total rata-rata rumah tangga masyarakat berkisar 5% sampai 100%. Responden pengelola ekowisata termasuk kategori sejahtera menurut indikator kesejahteraan Bank Dunia, namun pendapatan mayoritas responden masih di bawah Upah Minimum Kabupaten (UMK) Bekasi. Kata kunci: ekowisata, hutan mangrove, kesejahteraan, kontribusi, ABSTRACT FEBY DIMAS PERDANA. Contribution of Sunge Jingkem Mangrove Forest Ecotourism to the Income of the Samudra Jaya Village Community, Bekasi Regency. Supervised by LETI SUNDAWATI. Mangrove ecosystems have many direct benefits to people in the form of products or services, including the ability to provide food and natural attractions. The use of mangrove ecosystem services in the form of ecotourism will promote the conservation of mangrove ecosystem. This study aims to identify the characteristics of the community involved in the management of Sunge Jingkem Mangrove Forest Ecotourism in Bekasi District, analyse the contribution of Sunge Jingkem Mangrove Forest Ecotourism to community income and household welfare. Primary data was collected by interviewing 35 people who involved in management of the Sunge Jingkem Mangrove Forest Ecotourism. The research results show that the contribution of ecotourism to the average total household income ranges from 5% to 100%. Respondents who manage ecotourism are classified as prosperous category according to World Bank welfare indicators, but the majority of respondents incomes are still below the Bekasi Regency Minimum Wage (UMK). Keywords: Contribution, Ecotourism, Mangrove forest, Household welfare
Keyword: feby dimas perdana

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