Judul: Segmentasi Citra Menggunakan Metode Segitiga untuk Pengukuran Tingkat Kerapatan Hama Kutu Kebul
Abstrak: Whitefly, Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), is one of the major important pests of vegetables. Its small size and the insufficient number of pest observers have cause difficulties in monitoring the pests. One solution to overcome this problem is by using digital image processing. With digital image processing techniques, pest density can be measured accurately. In this study, triangle method is used to get the dynamic threshold value to be used in the segmentation process. The Images of vegetable used in this study are 23 images of eggplant leaves. The image will pass through several stages, including preprocessing, image segmentation and density calculations. The result of Image segmentation for 23 images using the triangle method has an accuracy of 75.36%. This suggests that the triangle method can be used for the segmentation process of whitefly pests in vegetable crops leaf image. By using this method, pest density calculation can be done optimally.
Keyword: Bemisia tabaci, triangle method, whitefly

Judul: Pendugaan Kerapatan Populasi Hama Kutu Kebul (whitefly) pada Tanaman Sayuran Menggunakan Watershed Segmentation
Abstrak: Witheflies Bemisia tabaci and Trialeurodes vaporariorum are two important pests on vegetables. This research proposed a new method of estimating population density of whiteflies using watershed algorithm. Estimate of population density was obtained by counting the number of pests found on leaves. Watershed algorithm is highly appropriate for segmentation of whitefly, because this algorithm works properly on objects which has low gray level variation and overlapping areas. The research methodology consisted of image acquisition, image preprocess, image enhancement segmentation, calculation of whitely, calculation of infested leaf area, calculation of whitefly population density, and evaluation of infestation level estimates. Data used in this research were digital images of vegetable leaves infested by the whiteflies. Image pre-processing was used to reduce errors that might occur in the process of segmentation with watershed algorithm. Image enhancement with was aimed to reduce noises. Whitefly calculation was done after image segmentation. Infestation area was calculated by sampling leaf areas. The goal was to separate the non object areas so not to be included in the calculation process. The calculation results used to determine the level of pest population density. Whitefly densities were calculated using two methods: sampling area and leaf segmentation. The sampling area method was used when the observed images had a background difficult to separate from leaf objects, and the leaves were not in perfect condition such as folded, truncated, or blured. Whereas, the leaf segmentation method were used when the leaves images were in perfect condition, not bent or not blured, and the background was easy to separate. The process of testing was done using images grouped into three levels: low, moderate, and severe. Results of both methods then were with the estimates by expert. Our research showed that estimation of whitefly population density had an error of 12,5%. The sampling area method was chosen to estimate whitefly density because of its closeness to the expert estimates. Based on this method, the pest population infetations were grouped into three levels: low (≤ 10%), moderate (> 10% until ≤ 30%), and severe (> 30%). The system of estimating whitefly density developed through this research is expected to help pest observers in executing pest population monitoring.
Keyword: image processing, estimation of pest density, watershed segmentation

Judul: Peranan Kepemimpinan dalam Resiliensi Komunitas terhadap Erupsi Gunung Merapi
Abstrak: Erupsi Gunung Merapi merupakan salah satu penyebab kerentanan komunitas Kalitengah Lor. Kerentanan membuat komunitas harus melakukan suatu upaya agar komunitas tersebut dapat resilien. Resiliensi komunitas akan terwujud dengan adanya aksi kolektif dan peranan kepemimpinan. Tujuan dari penelitian ini adalah untuk menganalisis kerentanan komunitas Kalitengah Lor, menganalisis aksi kolektif komunitas, menganalisis peranan kepemimpinan dalam resiliensi komunitas terhadap erupsi Gunung Merapi. Hasil penelitian menunjukkan komunitas Kalitengah Lor memiliki tingkat kerentanan tinggi. Peranan kepemimpinan dan tingkat partisipasi pada aksi kolektif komunitas Kalitengah Lor Tinggi. Peranan kepemimpinan dan adanya aksi kolektif komunitas dapat mengatasi dampak yang ditimbulkan dari erupsi gunung Merapi 2010 sehingga tingkat keberfungsian sistem dan tingkat kenyamanan komunitas Kalitengah Lor tahun 2017 meningkat. Resiliensi komunitas Kalitengah Lor dibangun melalui pembaharuan yang dilakukan pemimpin bersama komunitas dalam membangun wisata lokal, serta regenerasi dan reorganisasi kelembagaan di dalamnya.
Keyword: aksi kolektif, peranan kepemimpinan, kerentanan, resiliensi komunitas