Judul: Districts Clustering in Bogor Regency based on Social Welfare Issues using Ward Method
Abstrak: Penyandang Masalah Kesejahteraan Social (PMKS) / People with Social Welfare Issues are an evolving issue and should be addressed immediately. The government has programs to improve the welfare of PMKS, by the existence of Kelompok Usaha Bersama (KUBE), Rehabilitasi Rumah tidak Layak Huni (RRTLH), Usaha Ekonomi Produktif (UEP) and many more. One way to reduce the number of PMKS is allocated and distributed the programs appropriately, therefore cluster approach is needed to cluster districts based on social welfare issues in Bogor regency. Ward method is applied to obtain cluster because the result of clustering tends to produce cluster with small variance. Formation of four clusters approached the actual condition of social welfare issues exist in Bogor regency. The calculation shows mean square within clusters smaller than mean square among clusters, which indicates that the purpose of clustering has been reached. The main characteristics of cluster one are scavengers, violence victims, social disaster victims and family phsycosocial problem, the main characteristics of cluster two are minority group and street children, the main characteristics of cluster three are sluttish and trafficking victims, the main characteristics of cluster four are abandoned toddler, children with disabilities, beggars, people with HIV/AIDS and natural disaster victims. There are several social welfare issues tend to spread in every district, such as children in conflict with the law, the poor, waif, social problems of migrant workers, drug abuse victims, socio economically vulnerable woman, violence victims child, neglected elderly, people with disabilities, tramp, and ex-inmates institutions. Districts located in cluster four have highest number of social welfare issues, while cluster two has highest number of districts. Generally the social welfare issues most commonly face is the poor, while the fewest social welfare issues face are children who need special protection and trafficking victim.
Keyword: ward., squared euclidean, social welfare issues, clustering

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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