Judul: Penerapan metode Two Step Cluster untuk Mengklasifikasikan Desa-desa di Kabupaten Madiun Berdasarkan Data Potensi Desa
Abstrak: Pembangunan Desa merupakan bagian mendasar untuk pembangunan Nasional. Membangun desa membutuhkan informasi tentang apa yang dibutuhkan oleh masyarakat. Penelitian ini bertujuan untuk mengelompokkan desa-desa di Kabupaten Madiun yang memiliki persamaan karakteristik terhadap satu sama lain dan mengidentifikasi karakteristik gerombol-gerombol yang terbentuk. Sehingga, permasalahan khusus di dalam gerombol-gerombol desa dapat dijadikan dasar untuk melaksanakan pembangunan desa. Metode yang digunakan untuk amatan dengan peubah campuran adalah two-step cluster. Peubah yang digunakan dalam penelitian ini adalah 14 peubah terdiri dari enam peubah kategorik dan delapan peubah numerik. Analisis gerombol menghasilkan 4 kelompok. Kelompok yang memerlukan perhatian lebih untuk dikembangkan adalah kelompok 2 yang memiliki nilai terendah dalam segi sumber daya dan fasilitas. Koefisien Silhouette untuk kluster yang terbentuk adalah 0.3 yang dapat dikategorikan pada kategori fair.
Keyword: analisis gerombol, koefisien Silhouette, two-step cluster

Judul: Penerapan Metodetwo Step Cluster Dalam  Analisis Gerombol  (Studi Kasus : Data Potensi Desa Sensus Ekonomi 2003 Wilayah Jawa Barat)
Abstrak: Clustering is a process of grouping objects based on similarities . Some problems in cluster analysis are the different scale of measurement, large data sets and unspecified number of cluster. One approach to handle this problems is by using Two Step cluster method. The purpose of this research is to applicate Two Step cluster method by clustering villages residing in West Java. The result of Two Step cluster method are pre-cluster which early yielded at first phase counted eight clusters and optimal cluster which yielded at second phase counted three clusters. Members in first cluster are objects which is extreme outliers and cannot be grouped into other clusters. Villages which include into second clusters have rural characteristic. The village has wide farm, many agriculture households, but also has underdeveloped field of industries and also information and communications. So that, to improve village potency for this cluster, the variables which still have low growth level has to be increased. The third cluster has the characteristic of urban status. Village in this cluster has the closest distance to downtown, developed enough in the field of industry, information and communications, but still have the highest number for unemployment citizens.
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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