Judul: Severity Prediction Model for Bacterial Leaf Blight based on Multispectral Imagery and Enviromental Factors in Rice Plants
Abstrak: Penyakit hawar daun bakteri (HDB) menjadi salah satu penyakit penting tanaman padi yang diakibatkan oleh Xanthomonas oryzae pv. oryzae. Kerusakan akibat penyakit HDB ini mengakibatkan kehilangan hasil mencapai 50% sehingga perlu dilakukan pencegahan berupa pengendalian preventif yang memerhatikan faktor lingkungan. Besarnya pengaruh faktor lingkungan dapat diperkirakan melalui pemodelan dengan analisis regresi linier berganda. Penelitian ini bertujuan membangun model prediksi keparahan penyakit HDB berbasis citra multispektral dan faktor lingkungan. Model disusun dengan memasukkan 7 variabel penjelas yang meliputi Normalized Difference Vegetation Index (NDVI), umur tanaman, suhu udara, kelembapan udara relatif, lahan basah, lahan kering, dan varietas tanaman. Hasil penelitian menunjukkan bahwa seluruh variabel penjelas memiliki pengaruh yang nyata terhadap keparahan penyakit HDB dengan nilai koefisien determinasi (R2 ) sebesar 0,9157 atau 91,57%. Seluruh variabel penjelas kecuali umur tanaman menunjukkan hubungan yang berbanding terbalik dengan keparahan penyakit HDB. Model yang telah disusun menunjukkan nilai Root Mean Squared Error (RMSE) sebesar 0,6008 dan Mean Absolute Error (MAE) sebesar 0,4579 sehingga layak digunakan sebagai model prediksi keparahan penyakit HDB.
Keyword: bacterial leaf blight, multiple linear regression, multispectral image

Judul: Pemanfaatan Data Curah Hujan Untuk Prediksi Sebaran Penyakit Hawar Daun Bakteri Menggunakan Model SMCE (spatial multi criteria evaluation) Studi kasus: Tanaman Padi di Kabupaten Karawang
Abstrak: The potency of loss out caused by Bacterial Leaf Blight (BLB) caused by Xanthomonas campestris pv. oryzae shows the importance of plant disease controlling based on attack potention analysis. Rainfall is one of importan factor that affected distribution of BLB. The purpose of this research is to evaluate the effect of rainfall toward prediction about distribution of BLB with spacial method using SMCE model. The result shows that distribution of BLB much affected by rainfall. Higher rainfall affected more distribution of Xanthomonas campestris pv. oryzae. The high distribution of BLB is occured during rainfall of 50mm – 172 mm, with highest accumulation of rainfall within two weeks are 174 mm. If the rice plant attacked by bacterial when it was young stage until generatif phase, it's production will decrease. Karawang Regency have a medium distribution of bacterial with large enough distribution areas. Prediction result of BLB distribution using SMCE model shows that the areas that susceptible attacked from February until March 2011 in Karawang Regency are some of Lemahabang, Talagasari, Tirta Mulya, Purwasari, Klari, Batujaya, Rawamerta, Bayusari, some of Cibuaya and Jatisari.
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Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology