Judul: Konsumsi Pangan, Status Gizi, Akivitas Fisik, Status Kesehatan dan Status Hidrasi Mahasiswa TPB IPB Angkatan 2014.
Abstrak: Penelitian ini bertujuan untuk menganalisis konsumsi pangan, status gizi, aktivitas fisik, status kesehatan dan status hidrasi mahasiswa TPB IPB angkatan 2014 dengan desain penelitian cross sectional study. Jumlah subjek dalam penelitian ini 97 mahasiswa. Hasil penelitian menunjukkan bahwa sebagian besar subjek memiliki tingkat kecukupan zat gizi termasuk defisit berat dan tingkat kecukupan air termasuk kurang. Subjek dengan status gizi normal sebanyak 71.1%. Selanjutnya juga diketahui bahwa sebesar 35.1% subjek mempunyai status hidrasi kurang dan sebesar 10.3% subjek mempunyai status hidrasi sangat kurang. Tidak ada hubungan yang signifikan antara status gizi dengan status hidrasi dan tingkat kecukupan zat gizi (p>0.05). Terdapat hubungan yang signifikan antara status gizi dengan persen lemak tubuh (p=0.000, r= 0.711). Terdapat hubungan yang signifikan antara status hidrasi dengan tingkat kecukupan air berdasarkan kebutuhan air yang dihitung dengan rumus The National Research Council (NRC) (p=0.018, r=-0.240). Tidak terdapat hubungan yang signifikan antara status hidrasi dengan tingkat kecukupan air berdasarkan kebutuhan air yang dihitung dengan rumus Body Surface Area (BSA) dan berat badan (p>0.05).
Keyword: air, hidrasi, status gizi, zat gizi

Judul: Konsumsi Pangan, Aktivitas Fisik, Status Antropometri dan Persen Lemak Tubuh pada Mahasiswa
Abstrak: Penelitian ini bertujuan untuk menganalisis konsumsi pangan, aktivitas fisik, status antropometri dan persentase lemak tubuh pada mahasiswa. Subjek penelitian yang digunakan sebanyak 117 orang mahasiswa Tingkat Persiapan Bersama Departemen Gizi Masyarakat IPB Tahun Ajaran 2013/2014. Hasil penelitian menunjukkan bahwa sebagian besar subjek mengalami defisit tingkat berat pada zat gizi makro (energi, protein, lemak dan karbohidrat). Aktivitas fisik di hari kuliah dan libur sebagian besar berada dalam kategori ringan. Sebagian besar subjek memiliki status gizi normal, ukuran lingkar pinggang normal dan rasio lingkar pinggang dan pinggul normal. Persen lemak tubuh pada subjek laki-laki sebagian besar memiliki persen lemak tubuh normal (37,5%). Sementara itu, sebagian besar subjek perempuan memiliki persen lemak tubuh normal (56%). Terdapat hubungan bermakna antara indeks massa tubuh, lingkar pinggang, rasio lingkar pinggang pinggul, persen tingkat kecukupan energi dan zat gizi makro (protein, lemak, karbohidrat) dengan persen lemak tubuh (p<0.05). Namun, tidak terdapat hubungan bermakna antara aktivitas fisik dengan persen lemak tubuh (p>0.05).
Keyword: konsumsi pangan, aktivitas fisik, status antropometri, lemak tubuh

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