Judul: Pemanfaatan Informasi Iklim Dalam Pengembangan Model Peringatan Dini Dan Pengendalian Kejadian Penyakit Demam Berdarah Dengue Di Indonesia
Abstrak: Model Peringatan Dini Penyakit Demam Berdarah Dengue (DEWM) diperlukan dalam upaya antisipasi dan penanggulangan kejadian penyakit, yang pada akhirnya diperlukan untuk memberantas atau minimal menekan jumlah kasus DBD hingga batas yang dapat ditoleransi. Kejadian penyakit DBD berkaitan dengan kejadian iklim karena kehidupan vektor, patogen, dan perilaku maupun pengaturan fisiologi tubuh manusia dipengaruhi oleh iklim. Pengamatan, pencatatan, bahkan prediksi kejadian iklim secara rutin dan melembaga telah dilakukan. Oleh karena itu iklim berpotensi menjadi peubah penduga dalam model prediksi kejadian penyakit DBD sebagai bahan penyusun DEWM.
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Judul: Utilization of Climate Information for Dengue Hemorrhagic Fever (DHF) Model Prediction in Ciamis-West Java
Abstrak: Nyamuk Aedes aegypti sebagai vektor penyakit Demam Berdarah Dengue (DBD) dapat bertahan hidup dan berkembang biak pada kondisi iklim yang optimum. Antisipasi kejadian penyakit DBD diharapkan dapat dilakukan secara lebih baik dengan adanya model prediksi yang handal berdasarkan informasi iklim. Penelitian ini bertujuan untuk memperoleh tingkat keeratan hubungan antara unsur iklim dengan jumlah penderita DBD dan menyusun model prediksi tingkat kejadian penyakit DBD berdasarkan unsur iklim di Kabupaten Ciamis. Metode yang digunakan adalah metode deskriptif kuantitatif dengan analisis korelasi Pearson, komponen utama (PCA) dan regresi logistik ordinal. Tingkat kejadian penyakit dinyatakan dalam tingkat kejadian ringan, sedang dan berat, berdasarkan data jumlah penderita. Data yang digunakan yaitu data sekunder berupa data unsur iklim seperti suhu udara rata-rata (T), suhu udara minimum (Tn), suhu udara maksimum (Tx), kelembaban udara rata-rata (RH), curah hujan (CH), kecepatan angin (v), dan lama penyinaran matahari (LP) bulanan hasil observasi tahun 2015- 2020. Hasil analisis menunjukkan bahwa terdapat korelasi yang kuat antara Tn, Tx, RH, dan CH dengan jumlah penderita DBD. Model terbaik yang diperoleh yaitu model prediksi peluang kejadian ringan, sedang, dan berat berdasarkan 4 parameter iklim yang korelasi nyata tersebut, pada periode sebulan sebelum periode kejadian penyakit DBD dengan akurasi model sebesar 45%. Pengujian model prediksi dengan menggunakan data testing tahun 2021 menghasilkan nilai akurasi sebesar 54%.
Keyword: Aedes aegypti, korelasi pearson, parameter iklim, PCA, regresi logistik ordinal

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