Judul: Analisis penawaran ekspor teh hitam Indonesia dan permintaan impor teh hitam dunia
Abstrak: Meningkatkan ekspor komoditi non-migas, diantaranya komoditas pertanian dari subsektor perkebunan, yang akhir-akhir ini giat dilaksanakan oleh Pemerintah Indonesia merupakan salah satu upaya untuk mengatasi merosotnya penerimaan pemerintah di sektor migas. Usaha tersebut telah menunjukkan hasilnya. Teh hitam merupakan salah satu komoditas ekspor yang tidak kalah pentingnya dibandingkan dengan komoditas lainnya seperti kopi, lada, kelapa sawit dan lain-lain. Indonesia merupakan negara pengekspor teh kelima di dunia setelah India, Sri Langka, RAC dan Kenya…dst
Keyword: Tea  Exports, Camellia sinensis

Judul: Analisis permintaan dan penawaran teh Indonesia di pasaran domestik dan international
Abstrak: Dalam segi permintaan di pasaran domestik, baik teh hitam maupun teh hijau permintaannya tidak dipengaruhi oleh harganya, komoditi substitusinya, pendapatan konsumen, mau- pun tingkat konsumsi yang diinginkan oleh konsumen. Pen- dekatan secara keseluruhan (Agregat), juga diperoleh hasil yang konsisten. Dalam segi penawaran ekspor, teh hitam relatif telah berorentasi pada pasaran internasional. Disamping itu penawaran teh hitam di pasaran internasional juga dipengaruhi oleh pena- waran pada pasaran domestik pada periode sebelumnya, dan ni lai tukar. Sedangkan pengaruh dari variabel-variabel permintaan dan penawaran domestik lainnya tidak menunjukkan penga ruh terhadap penawaran ekspor teh Indonesia, hal ini disebabkan oleh karena teh hitam dalam strategi pemasarannya memang berorentasi pada ekspor. Dalam segi daya saing, ekspor teh Indonesia di pasaran internasional bersaing dengan teh dari Tanzania; bersifat independen dengan teh dari India, Srilangka, dan Kenya; dan mempunyai daya saing yang lebih tinggi dibandingkan dengan ekspor teh dari Mozambik dan Uganda.
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