Judul: Keberadaan Cendawan pada Lingkungan Permukiman di Bogor.
Abstrak: Mikroorganisme memiliki peran positif dan negatif yang tersebar di berbagai tempat termasuk di udara. Populasi mikrob, seperticendawan dipengaruhi oleh berbagai faktor seperti permukiman dan perilaku manusia. Desinfektan dan pestisida merupakan contoh bahan kimia yang paling sering digunakan dalam rumah tangga. Penelitian ini bertujuan mengetahui hubungan antara jenis pemukiman dan kondisi sanitasi dengan populasi cendawan. Penelitian ini dilakukan dari bulan Mei hingga Juli 2017. Pengamatan dilakukan pada tiga jenis permukiman dengan menggunakan data primer berupa isolasi cendawan pada masing-masing rumah dan data sekunder berupa hasil wawancara. Cendawan yang ditermukan pada ketiga lokasi permukiman adalah Aspergillus, Penicillium, dan Fusarium.Cendawan Aspergillus paling banyak ditemukan pada permukiman elit, sedangkan Penicillium dan Fusarium banyak ditemukan di permukiman kumuh. Apabila dijumlahkan ketiga cendawan, koloni cendawan yang paling banyak ditemukan pada permukiman BTN.
Keyword: desinfektan, mikrob, pestisida, tipe permukiman

Judul: Exploration of Entomopathogenic Fungi as  Potential Biological Control Agents for Insect Pests in Various Rhizosphere in Bogor.
Abstrak: Cendawan entomopatogen merupakan salah satu agen biologis yang dapat digunakan untuk mengendalikan serangga hama. Untuk mendapatkan cendawan entomopatogen ini, salah satunya adalah dengan cara mengisolasinya dari rizosfer berbagai jenis tanaman. Tujuan utama dari penelitian ini adalah untuk mendapatkan jenis-jenis cendawan entomopatogen di rizosfer berbagai jenis tanaman. Sampel tanah diambil dengan metode pengambilan systematic random sampling dari perkebunan bambu dan cabai di Kabupaten Bogor, Jawa Barat. Cendawan entomopatogen potensial diidentifikasi di Laboratorium Patologi Serangga dan Laboratorium Nematologi, Departemen Perlindungan Tanaman, Fakultas Pertanian, Universitas IPB, Bogor. Koleksi dan isolasi cendawan entomopatogen dari tanah dilakukan dengan metode perangkap serangga yang kemudian dimurnikan dan dikonfirmasi menggunakan metode postulat Koch. Identifikasi cendawan entomopatogen dilakukan pada tingkat genus dengan mengamati karakteristiknya secara makroskopis dan mikroskopis. Hasil penelitian menunjukkan bahwa ada dua spesies cendawan entomopatogen yang memiliki potensi tinggi untuk digunakan, yaitu Metarhizium anisopliae dan Metarhizium robertsii.
Keyword: Agens hayati, Rizosfer, Cendawan entomopatogen, Postulat Koch

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