Judul: Penerapan Metode CART dan Agregat Bootstrap dalam Klasifikasi Status Gizi Balita Di Kecamatan Taman Sari, Kabupaten Bogor.
Abstrak: Nutrition problem is a multidimensional problem that affect health and productivity of Indonesian society. The number of short nutritional status (stunting) and high malnutrition is a serious health problem because it picturizes life for the next 100 years. About 90% of the short children problems in the world occur in 36 countries, and the rank of Indonesia is number five. The purpose of this study is to determine the factors that affect the nutritional status of children and evaluate the stability of classification trees with bootstrap aggregating method.The research is conducted at Taman Sari subdistrict, Bogor with the number of samples 120 mothers who have toddlers. Statistical analysis used to analyze the factors that influence the nutritional status of children is the method of CART (Classification and Regression Tree). CART is a method of data exploration which uses decision tree technique. This study also applies bagging method (bootstrap aggrergating) to evaluate the stability of classification trees generated by CART. The results of the classification tree formed produces optimum tree with eight terminal nodes. Explanatory variables into the main node is the nutritional behavior. Level of accuracy for the CART method was 69.17%.The percentage of the classification on the delimitation of the best z using z-score -2.5 SD with level of accuracy 76.67% and 88.33%, and z-score -3 SDwith level of accuracy 73.33% and 79.17%. Bagging method has been able to evaluate the stability of classification trees by 79.28%.
Keyword: bootstrap aggregating, CART, the nutritional status of children

Judul: Studi Analisis Keadaan Rumah Ibu Balita, Kebiasaan Makan Balita, Status Gizi Balita dan Status Kesehatan Balita di Kecamatan Tamansari, Kabupaten Bogor
Abstrak: This study analyzes house condition, eating habits, nutrition nutritional status and health status of underfive children in Tamansari, Bogor. This research is part of the research entitlet “A Multi-Approach Intervention to Empower and Posyandu Nutritional Program to Combat Malnutrition Problem in Rural Areas” was conducted on February 2012 using cross sectional study design. Sample of this study were 120 mother and underfive children selected by purposive sampling with criterias (1) family who have underfive children (boy and girl 0-60 month), (2) registered as posyandu participant, (3) ready for interviewed. Data used was is primary data including characteristics of the sample and family such as number of family member, family income, age, education, and occupation, underfive children characteristics (gender and age), home conditions, eating habits, nutritional status and health status.Secondary data including overview of location research. The analysis was carried out by Structural Equation Modeling (SEM). Based on SEM analysis, the house condition had significant effect on nutritional status (T-value= 2.533). eating habitshad significant effect on nutritional status(T-value=-2.0798). nutritional status had significant influence to health status (T-value= 8.4189).
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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