Judul: Penentuan Penciri Keragaman Konsumsi Pangan Rumah Tangga Rawan Pangan Dengan Metode Chaid Dan Exhaustive Chaid
Abstrak: Keragaman konsumsi pangan merupakan salah satu faktor yang menentukan status gizi individu juga masyarakat. Keragaman pangan individu dipengaruhi oleh karakteristik rumah tangga. Penelitian ini bertujuan untuk menentukan penciri keragaman pangan pada rumah tangga rawan pangan di Kabupaten Bogor. Metode yang digunakan adalah Chi-Squared Automatic Interaction Detection (CHAID) dan exhaustive CHAID. Metode CHAID merupakan analisis non parametrik yang dapat digunakan untuk melihat keterkaitan antar peubah yang memiliki peubah respon kategorik. Output dari analisis CHAID adalah pohon klasifikasi. Dasar pengambilan keputusan metode CHAID menggunakan nilai khi-kuadrat. Metode exhaustive CHAID merupakan pengembangan dari metode CHAID. Hasil penelitian menunjukkan bahwa karakteristik rumah tangga yang menjadi penciri keragaman konsumsi pangan pada rumah tangga rawan pangan adalah agroekologi, status pekerjaan ibu, dan jenis pekerjaan kepala rumah tangga. Peubah yang menjadi penciri keragaman konsumsi pangan pada metode CHAID tidak berbeda dengan metode exhaustive CHAID. Perbedaan terletak pada jumlah kelompok yang dihasilkan pada jenis pekerjaan. Jenis pekerjaan pada metode CHAID terbagi menjadi 3 kelompok sedangkan pada metode exhaustive CHAID terbagi menjadi 4 kelompok. Hal ini terjadi karena koefisien pengali Bonferroni pada metode exhaustive CHAID telah dilakukan penyesuaian sehingga menghasilkan penduga dengan tingkat kepercayaan yang lebih besar.
Keyword: CHAID, exhaustive CHAID, HDDS, keragaman konsumsi pangan

Judul: Kajian Mengenai Berbagai Metode Penilaian Keragaman Konsumsi Pangan Rumah Tangga
Abstrak: Household dietary diversity can be measured using Desirable Dietary Pattern (DDP), Household Dietary Diversity Score (HDDS), and modified HDDS. The general objective of this research is to compare several methods for assessing household dietary diversity. The specific objectives of this research were to identify characteristics of households, household food expenditure, and household dietary diversity; analyze correlation between household food expenditure and characteristics of households; and analyze correlation between household food expenditure and household dietary diversity based on DDP, HDDS, and modified HDDS. This research was cross-sectional study and used 118 households in Citayam and Babakan Village. This research was a part of research project “Validation of Modified HDDS (Household Dietary Diversity Score) for Recipient Household of Food Diversification Program in Bogor District” that was leaded by Dr Ir Yayuk Farida Baliwati, MS. Almost households in Citayam and Babakan Village was categorized as small household (59.32%). Fathers and mothers had low education level (36.44%, 44.92%). Fathers and mothers were categorized as middle adult (58.48%, 64.41%). Almost fathers worked as trader (25.42%) while mothers worked as housewife (73.73%). Almost households had high food expenditure level (50.85%). Household dietary diversity was high based on HDDS (95.76%) and modified HDDS (81.35%) but very low based on DDP (50.85%). Spearman correlation test showed that there were positive correlation between household food expenditure with education level of fathers (p=0.022 r=0.210), mothers (p=0.010 r=0.236), and total household members (p=0.003 r=0.275). Household food expenditure had positive correlation with household dietary diversity based on DDP (p=0.006 r=0.250) and HDDS (p=0.008 r=0.242). But household food expenditure didn’t correlate with household dietary diversity based on modified HDDS. Variation of dietary diversity based on DDP just could be determined by food expenditure about 3.9% (p=0.018 r2=0.039) but variation of dietary diversity based on HDDS could not be determined by food expenditure (p=0.061 r2=0.022). So, there was no recommendation method for assessing household dietary diversity.
Keyword: Bogor Agricultural University, DDP, dietary diversity, dietary diversity, food expenditure, HDDS, modified HDDS

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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