Judul: Techniques of Texture Analysis for Identification of Crocidolomia pavonana, Spodoptera exigua, Spodoptera litura
Abstrak: Cabbage and green onion are two common vegetables cultivated by farmers in highland. Among major pests causing significant damage are Crocidolomia pavonana on cabbage and Spodoptera exigua on green onion. In addition, the generalist Spodoptera litura occasionally found attacking these vegetables. For unexperienced farmers as well as extension agents, the three caterpillars are not easily differentiated; although an accurate identification is required for a better control of the pests. Therefore, research was conducted with the objectives to develop identification system of the caterpillars based on computer vision technology. The three species of caterpillars have a unique texture and distinct feature from each other; and therefore, differentiating the species can be based on techniques of texture analysis. For this purpose, we used combination of several texture analysis: entropy feature, GLCM, Haralick features and Tamura feature. Each species consisted of 45 images, and consequently the total images used in this research were 135 images. Data work splitted using k-fold cross validation technique into training data (80%) and testing data (20%). Probabilistic Neural Network (PNN) was applied for classifying the three species of caterpillars. Research was conducted using GLCM with 1 pixel distance and 8 angles; Haralick features consisting of entropy, homogeneity, information of correlation 1, information of correlation 2; and Tamura feature consisting of coarseness; and entropy feature techniques. Our research revealed that Tamura features and information of correlation 1 were able to differentiate S. litura from other species. Entropy feature was able to differentiate C. pavonana with S. litura. Haralick entropy was able to differentiate C. pavonana with S. Exigua. Homogeneity was able to differentiate S. Exigua with S. litura whereas information of correlation 2 was not able to differentiate among the three species. However, combination of four techniques were able to improve the accuracy of caterpillar identification system. System performance obtained from the average accuracy of the entire fold reached 77.03%. The best accuracy (88.89%) was obtained when k = 5. Furthermore, we tested the system using classification model based on the fifth fold. Error occurred when C. pavonana incorrectly identified as S. exigua, and S. exigua incorrectly identified as S. litura. The error in identification were caused by inappropriate cropping of caterpillar images, the blur of image, and the caterpillar was not in advance stage. However, in general the pest identification system developed through this research can be used by farmers and extension agents who have difficulties in differentiating the three species of caterpillars.
Keyword: textures analysis, computer vision, pest identification

Judul: Identifikasi Hama Ulat Kubis Menggunakan Transformasi Wavelet dengan Klasifikasi Probabilistic Neural Network
Abstrak: This research proposes a method for moth pests identification using wavelet transformation and Probabilistic Neural Netwok (PNN). Wavelet transformation method is used to get image features. This study focused on 3 types of moth pests that Crocidolumia binotalis zeller, Spodoptera exigua (Hubner), and Spodoptera litura F. To get the best performance of classifier was analyzed by confussion matrix and k-fold cross validation with k = 5. Result for identification of moth pests diamondback in this study showed an average accurancy of 80.74%. This result shows that the wavelet transformation and classifier Probabilistic Neural Network can be applied for the identification of cabbage caterpillar pests
Keyword: Wavelet Transformation., PNN, Cabbage Caterpillar Pest

Judul: Rancangan alat elekrolisa air (H2O) Untuk produksi gas oksigen (H2) dan bahan bakar gas hidrogen (H2)
Abstrak: Dengan semakin meningkatnya populasi penduduk dan peradaban manusia, maka semakin meningkat pula kebutuhan pemakaian energi. Akan tetapi sumber energi yang ada sekarang ini terutama BBM cenderung semakin berkurang. Disamping itu, pada pembakaran sumber energi tersebut dapat menimbulkan pencemaran terhadap udara sehingga udara menjadi kotor, kandungan CO₂ meningkat, dan kandungan oksigen di atmosfer menurun. Peningkatan gas CO₂ dapat menyebabkan efek pemanasan global di permukaan bumi ini. Dengan demikian hal-hal diatas akan menyebabkan masalah baru bagi kehidupan manusia. Oleh karena itu usaha-usaha pencarian sumber energi baru yang ramah terhadap lingkungan sangat diperlukan dalam rangka mengurangi atau menanggulangi masalah-masalah diatas. Hidrogen merupakan sumber daya energi yang sangat potensial untuk dikembangkan dan diteliti lebih lanjut. Sebagaimana diketahui bahwa unsur hidrogen dalam bentuk air banyak terdapat di alam, dan dalam proses pembakarannya akan kembali dihasilkan air, sehingga keberadaan sumber daya ini seolah-olah tak terbatas. Begitu pula hasil proses pembakaran hidrogen tidak menimbulkan polusi sehingga tidak menggangu kebersihan lingkungan. Oksigen merupakan sesuatu hal yang tidak pernah lepas dari kehidupan kita, karena oksigen adalah bagian utama dari proses metabolisma tubuh. Selain itu penggunaan gas oksigen beraneka ragam antara lain untuk aplikasi pengobatan dan kesehatan, bidang perikanan, proses pelapisan logam, sintesis kimia, oksigen pernafasan bagi penyelaman dan penerbangan, pembuatan bahan bakar sintetik dan hal-hal kecil lainnya. Salah satu cara untuk memproduksi hidrogen dan oksigen adalah dengan proses elektrolisa yaitu dengan mengurai air (H₂O) menjadi oksigen (O2) dan hidrogen (H₂) dengan bantuan energi listrik.
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