Judul: Analisis Regresi Logistik Spasial untuk Menduga Status Kemiskinan Desa di Kabupaten Majalengka
Abstrak: Rural poverty status is influenced by several factors that are correlated between one rural area and the other. Logistic regression modeling with spatial weights is needed to determine the factors that affect rural poverty hotspots that are spatially correlated. Categorization of rural areas into hotspot (1) and non hotspot (0) was based on a hotspot Upper Level Set (ULS) Scan Statistic method which obtained 187 hotspot rural areas and 149 rural non hotspot. Rural hotspot areas have characteristics similar to non rural hotspot areas in various aspects. Logistic regression models with Spatial variable enhances logistic regression model without Spatial variable in predicting the status of rural poverty areas in Majalengka. Logistic regression models with Spatial variable has a higher correct classification rate (CCR) compared to logistic regression without Spatial variable. The explanatory variables that have a significant influence towards the status of rural poverty are Percentage of Farm Worker Families variable and Spatial variable.
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Judul: Penerapan Regresi Logistik Ordinal Spasial Untuk Menduga Status Kemiskinan Kabupaten Di Pulau Jawa
Abstrak: Analisis regresi logistik ordinal spasial merupakan analisis yang menduga pengaruh variabel penjelas terhadap variabel respon yang berupa data ordinal dengan ditambahkan unsur spasial di dalamnya. Pengaruh Spasial yang dimaksud adalah adanya matriks kebertetanggaan antar kabupaten yang akan diperhitungkan ke dalam model regresi logistik ordinal. Variabel respon berisi data berskala ordinal berupa enam tingkatan kemiskinan. Kemiskinan suatu daerah tidak lepas dari daerah di sekelilingnya, hal ini menunjukan adanya korelasi spasial yang perlu diteliti lebih lanjut. Penelitian ini bertujuan untuk mengetahui faktor-faktor yang mempengaruhi tingkat kemiskinan kabupaten di Pulau Jawa berdasarkan model regresi logistik ordinal spasial dan untuk membandingkan model regresi logistik ordinal spasial terhadap model regresi logistik ordinal non spasial. Data yang digunakan dalam penelitian ini adalah data sekunder, data variabel penjelas diperoleh dari data Potensi Desa (PODES) dan data Survei Sosial Ekonomi Nasional (SUSENAS) tahun 2005 sedangkan data variabel respon diperoleh dari hasil hotspot kemiskinan kabupaten di Pulau Jawa pada tesis Dian Kusumaningrum tahun 2010. Hasil analisis menunjukan bahwa model regresi logistik ordinal non spasial memiliki nilai Correct Classification Rate (CCR) sebesar 51.85%, sedangkan model Regresi logistik ordinal spasial memiliki nilai CCR sebesar 55.56% dengan besarnya sumbangan keragaman dari variabel spasial sebesar 43.056. Jadi dapat disimpulkan bahwa model regresi logistik ordinal spasial lebih baik dari pada model non spasialnya. Ada empat variabel yang berpengaruh terhadap tingkat kemiskinan suatu kabupaten di Pulau Jawa yaitu persentase desa perdagangan, persentase desa jasa, persentase keluarga tanpa listrik dan variabel spasial kemiskinan kabupaten.
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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