Judul: Analisis Preferensi Konsumen dan Tingkat Kepuasan Terhadap Atribut Sayuran Organik
Abstrak: Sayuran organik merupakan sayuran yang dihasilkan dari proses bercocok tanam secara alami yang mengandalkan unsur-unsur alam sehingga produk yang dihasilkan tidak mengandung bahan kimia berbahaya. Sampai sejauh ini, umumnya sayuran organik lebih mudah ditemukan di kota-kota besar di Indonesia dan dipasarkan di pasar modern atau pasar swalayan tertentu. Hal tersebut disebabkan karena harga yang ditawarkan oleh produsen kepada konsumen untuk bisa mendapatkan sayuran organik relatif lebih mahal dari pada sayuran anorganik. Penelitian ini bertujuan untuk menganalisis karakteristik konsumen sayuran organik, preferensi konsumen sayuran organik, tingkat kepuasan konsumen terhadap atribut sayuran organik dan ketertarikan antara ketiganya. Metode pengumpulan data yang digunakan berupa teknik purposive sampling melalui penyebaran kuesioner kepada 140 responden. Sedangkan, metode pengolahan data yang digunakan dalam penelitian ini yaitu analisis deskriptif, analisis konjoin, Importance Performance Analysis (IPA), Customer Satisfaction Index (CSI) dan Chi Square. Hasil perhitungan preferensi konsumen dalam penelitian ini menunjukkan bahwa, kemasan merupakan indikator yang memiliki tingkat kepentingan tertinggi sebesar 28,99 persen. Berdasarkan hasil IPA, terdapat dua atribut yang memiliki prioritas utama untuk diperbaiki kinerjanya oleh Top Buah Segar Cibubur yaitu harga sayuran organik terjangkau dan potongan harga sayuran organik. Kemudian berdasarkan hasil perhitungan CSI didapatkan nilai sebesar 76,67 persen, dimana dari hasil perhitungan tersebut konsumen dinyatakan puas terhadap kinerja Top Buah Segar Cibubur. Uji Chi Square menunjukkan bahwa pada hasil karakteristik konsumen dengan preferensi konsumen didapatkan bahwa indikator jenis kelamin, usia, pekerjaan dan penerimaan memiliki keterkaitan dengan indikator harga pada preferensi, kemudian indikator pekerjaan memiliki keterkaitan dengan indikator label. Pada hasil karakteristik konsumen dengan kepuasan konsumen didapatkan bahwa status pernikahan memiliki keterkaitan dengan harga pada kepuasan, kemudian untuk pekerjaan memiliki keterkaitan dengan tempat. Pada hasil preferensi konsumen yang meliputi jenis sayuran, harga pada preferensi, kemasan dan label tidak memiliki keterkaitan dengan tingkat kepuasan konsumen yang meliputi produk, harga pada kepuasan, tempat dan promosi., Organic vegetables are vegetables produced by natural farming which depend on the elements so that products produced are devoid of chemical elements. Thus far, organic vegetables are easier to locate in major cities in Indonesia and mainly marketed in modern markets or supermarkets. It is caused by the price offered by producer to consumer to be able to get organik vegetables is relatively higher than inorganik vegetables. The study aims to analyze the characteristics of the consumer of organic vegetables, the consumer preferences for organic vegetables, the level of consumer satisfaction towards organic vegetables, and the correlation between those three variables. The data have been collected using purposive sampling technique through distribution of questionnaire to 140 respondents. Meanwhile, the data processing methods used in this research include descriptive analysis, conjoint analysis, Importance Performance Analysis (IPA), Customer Satisfaction Index (CSI), and chi square. Consumer preference calculations in this study indicate that packaging is an indicator with the highest levels of interest at 28,99 percent. According to IPA results, there are two attributes that have the highest priority for performance improvement by Top Buah Segar Cibubur which is the price of affordable organik vegetables and discounts on organic vegetables. According to CSI, the calculation results is 76,67 percent, which means the consumer was content with the performance
Keyword: importance performance analysis (ipa), customer satisfaction index (csi), customer's preference, customer satisfaction

Judul: Analisis Preferensi Konsumen Terhadap Atribut Sayuran Organik di Kota Bogor
Abstrak: Organic vegetables are now widely available in the markets; it has brought a tight inter-brand competition in the market. The increased competition will lead the organic vegetable producer to understand their costumers’ interest in buying organic vegetables offered. This study aims to identify the characteristics of the consumer and the buying decision process using descriptive analysis, and analyze attributes preferences in the organic vegetables as well as combinations of attributes that are most preferred by consumers using conjoint analysis. The attributes that will be examined includes; price, packaging, labeling, and diversity/variety of organic vegetables. The data used are primary data obtained from questionnaires to 100 respondents, analyzed using descriptive and analytical tools with the conjoint analysis software SPSS for windows. The results showed that the organic label is the most important attribute in organic vegetable products. While the combination most preferred by consumers is price 15% lower than the average price of non-organic vegetables, plastic box packaging, has an organic label, and has a lot of diversity/variety of organic vegetables.
Keyword: Consumer Preferences, Organic, Conjoint, Attributes

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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