Judul: Penerapan Regresi Logistik Ordinal untuk Menganalisis Tingkat Kerusakan Tanaman Padi Akibat Serangan Wereng Batang Coklat
Abstrak: Nilaparvata lugens which recognized by wereng batang coklat (WBC) is one of the pest groan paddy. WBC can cause the paddy wilt and dead run dry so that the result of rice production can’t maximum. One of the form operation WBC attack is look for the damage factors with ordinal logistic regression analysis. Ordinal logistic regression analysis concludes two factors of paddy’s damage because of WBC attack, there are paddy’s variety (X2) and frequency of manure giving (X5). The importance level both variable can be grade by dominance analysis. Dominance analysis concludes that X2 is first grade and X5 is second grade, so the primary factor of paddy’s damage is paddy’s variety. This research concludes that IR-42 and IR-64 is variety that immune from WBC.
Keyword: wereng batang coklat, ordinal logistic regression, dominance analysis

Judul: Computer Vision untuk Penapisan Tingkat Resistensi Varietas Padi Terhadap Wereng Batang Cokelat
Abstrak: Wereng batang cokelat (WBC) merupakan salah satu hama penting yang dapat mengancam kestabilan produksi padi nasional. Salah satu upaya untuk mengendalikan serangan hama WBC adalah penggunaan varietas resisten. Pada saat ini, penapisan galur resisten didasarkan pada skor kerusakan yang dilakukan secara manual oleh tenaga ahli yang berpengalaman. Namun demikian, ketersediaan tenaga ahli tersebut sangat terbatas. Oleh karena itu, perlu dikembangkan pendekatan lain yang dapat mendukung kelancaran kegiatan penapisan resistensi galur padi. Pada penelitian ini dikembangkan sebuah prototipe aplikasi sistem penduga tingkat resistensi dengan pendekatan warna CIELab citra. Metode penelitian terdiri atas pengumpulan citra data penelitian (akuisisi data), segmentasi latar belakang dan objek (praproses), penentuan proporsi area yang terserang (menguning dan mati) dan sehat berdasarkan nilai A dari ruang warna CIELab, kemudian dilakukan evaluasi berdasarkan proprosi luasan area terserang menggunakan metode confusion matrix dan error rate. Berdasarkan hasil persebaran nilai proporsi area terserang, diperoleh aturan penapisan resistensi tanaman padi terhadap wereng batang cokelat berdasarkan citra. Aturan tersebut mirip dengan aturan baku IRRI karena melakukan pemberian skor berdasarkan gejala serangan WBC. Pada sistem pendugaan tingkat resistensi ini dilakukan pendekatan menggunakan fitur warna. Seluruh citra dinilai berdasarkan aturan tersebut, kemudian dimodelkan dan didapatkan error rate antara pemberian skor pakar dengan sistem komputer sebesar 13,1 %.
Keyword: brown planthopper, color extraction, resistance, rice

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4