Judul: Clustering Jamur Asterinaceae Menggunakan Metode K-Means
Abstrak: Fungi are one of the many cultivated crops by farmers in upland areas. Fungi are beings who are heterotrophic eukaryotes, which absorbs organic matter from the environment so that his life is parasitic and saprophyte. Diversity of these fungi cause difficulty to distinguish between one type and another. Before identifying fungi taxa Asterinaceae Australia, a grouping or clustering method is required to recognize the fungi by their characteristics. In grouping these fungi, characteristics possessed are first converted into binary form. K-Means clustering method is then utilized. There are three main stages for the clustering purpose, namely normalization, K-Means method, and Davies Bouldin Index calculation. The results show that the best clustering is obtained with 10 clusters.
Keyword: K-Means., fungi Asterinaceae, Davies Bouldin Index

Judul: Clustering composition of medical herbs using K-means algorithm
Abstrak: Jamu adalah obat tradisional berbahan alami. Jamu merupakan warisan budaya Indonesia yang dipercaya bermanfaat untuk kesehatan. Dalam perkembangannya telah dilakukan penelitian tentang hubungan antara komposisi dan khasiat jamu yang memiliki aktivitas farmakologi tertentu. Namun, dalam perkembangannya hubungan khasiat jamu dengan komposisi yang terkandung di dalamnya menjadi topik yang menarik untuk dikembangkan. Clustering adalah salah satu metode pengelompokan sejumlah obyek berdasarkan ciri atau atribut tertentu ke dalam sejumlah kelompok (cluster). Metode ini digunakan untuk mengelompokkan tanaman herbal penyusun jamu untuk dianalisa hubungan antara khasiat dengan komposisi jamu menggunakan algoritme K-means. Tanaman jamu yang dikelompokkan memiliki khasiat yang sama dengan efikasi yang dominan pada kelompoknya., Jamu is a traditional medicine that made from natural ingredients. Jamu is Indonesian national heritage that believed to be useful for health. In the development of the research has been done, found the relationship between the composition and efficacy of herbs that have specific pharmacological activity. However, the efficacy of herbal medicine development relationship with the composition becomes an interesting topic to be developed. Clustering is one of method to grouping a number of objects based on certain characteristics or attributes into a number of groups (clusters). This method is used to classify the ingredients of herbs that used to compose jamu and analyze relationship between efficacy and composition of jamu using k-means algorithm. Herbs are classified as having the same efficacy of the dominant group. Keywords: Clustering, Herbal Medicine, Herbs, K-means
Keyword: Clustering, Jamu, K-means, Tanaman Herbal

Judul: Sintesis BaTiO3 dari Campuran Ba(OH)2 dan TiO2 dengan Tambahan PbO
Abstrak: Piezoelectric material can generate electric field in response to applied mechanical stress. Conversely, they can stretch and contract in response to an electric field. This material can be used for many applications such as transducer, microphone, ultrasound, and pressure gauge. Barium titanate is a ferroelectric material with piezoelectric properties that can be synthesized easily. The aim of this study is to synthesis barium titanate from mixture of Ba(OH)2 and TiO2, also observe its optimum temperature and the effect of PbO addition. The method of synthesis was solid-state reaction and sol-gel method, then the products were characterized with x-ray diffraction (XRD). Based on XRD analysis, the optimum temperature for both methods was 800°C. Addition of PbO to BaTiO3 in the solid-state reaction formed a compound with formula of Ba1-xPbxTiO3. The addition has changed diffraction pattern peak at 2θ and strengthened its tetragonal structure. The best result was obtained at x of 0.5 which will form a compound of Ba0.5Pb0.5TiO3.
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