Judul: Evaluation Sensory Profile of Coconut Yogurt Chocolate Product PT XYZ Using Check-All-That-Apply (CATA) Method
Abstrak: Kesadaran masyarakat untuk hidup sehat semakin meningkat sehingga menyebabkan berkembangnya pangan yang memberikan efek kesehatan atau dikenal dengan pangan fungsional. Salah satu jenis pangan fungsioal adalah yogurt. Yogurt yang banyak dikenal masyarakat saat ini adalah yang berasal dari susu sapi. Kelemahan penggunaan yogurt berbahan dasar susu sapi adalah tidak semua masyarakat dapat mengonsumsinya, karena alasan dapat menimbulkan alergi, menyebabkan lactose intolerant, dan vegan. Penelitian ini bertujuan untuk mengidentifikasi profil sensori pada proses pengembangan produk Coconut Yogurt Chocolate di PT XYZ berdasarkan persepsi konsumen. Metode evaluasi sensori berbasis konsumen yang digunakan pada penelitian ini adalah Check-All-That Apply (CATA). Penelitian ini dilakukan dengan beberapa tahapan yaitu persiapan dan pengujian kuisioner, survei konsumen, focus group discussion (FGD), persiapan dan pengujian tiga sampel dengan metode CATA (jenis cocoa mass natural, cocoa mass alkalized dan cocoa powder), dan analisis data menggunakan perangkat lunak XLSTAT. Hasil pengujian menunjukkan bahwa atribut sensori ideal menurut konsumen adalah sweet aftertaste, rasa gurih, sour aroma, coconut flavor, sweet flavor, chocolate flavor, chocolate aroma, coconut milk aroma, dan mouthcoat mouthfeel. Produk cocoa powder paling mendekati dengan produk ideal dan memiliki atribut sensori yang ada pada produk ideal dan liking. Atribut needstate diperoleh hasil yang berbeda setiap sampel, atribut needstate ideal menurut konsumen adalah health maintenance dan pleasure, sedangkan yang mempengaruhi tingkat kesukaan (liking) adalah relaxation dan pleasure. Rekomen dasi perbaikan produk mengacu pada atribut ideal dan liking, atribut yang termasuk ke dalam dua kelompok tersebut antara lain rasa manis (sweet), sweet aftertaste, mouthcoat mouthfeel, chocolate aroma, dan chocolate flavor. PT XYZ dapat menggunakan sampel 3 sebagai peluncuran produk baru karena telah sesuai dengan preferensi, kebutuhan, dan keinginan atau kesukaan (hedonik) konsumen., Public awareness for healthy living is increasing, causing the development of foods that provide health effects or known as functional foods. One type of functional food is yogurt. Yogurt that is widely known to the public today is derived from cow's milk. The disadvantage of using yogurt made from cow's milk is that not all people can eat it, for reasons it can cause allergies, cause lactose intolerance, and are vegan. This study aims to identify the sensory profile in the product development process of Coconut Yogurt Chocolate at PT XYZ based on consumer perceptions. The consumer-based sensory evaluation method used in this study is Check-All-That-Apply (CATA). This research was conducted in several stages, namely the preparation and testing of questionnaires, consumer surveys, focus group discussions (FGD), preparation and testing of three samples using the CATA method (types of natural cocoa mass, alkalized cocoa mass and cocoa powder), and data analysis using software XLSTAT. The test results show that the ideal sensory attributes according to consumers are sweet aftertaste, savory taste, sour aroma, coconut flavor, sweet flavor, chocolate flavor, chocolate aroma, coconut milk aroma, and mouthcoat mouthfeel. Cocoa powder products are closest to the ideal product and have the sensory attributes that exist in the ideal product and liking. Need state attribute obtained different results for each sample, the ideal need state attribute according to consumers is health maintenance and pleasure, while those that affect the level of liking are relaxation and
Keyword: Check-All-That-Apply (CATA), Chocolate, Coconut Milk, Sensory Evaluation, Yogurt

Judul: Emotional Sensory Mapping Susu Cokelat Kemasan  Dengan Metode CATA (Check-All-That-Apply)
Abstrak: Konsumsi susu cokelat di Indonesia mengalami peningkatan, hal ini dipengaruhi oleh semakin meningkatnya kesadaran konsumen terhadap gaya hidup sehat dan juga cita rasa yang khas pada susu cokelat dibandingkan dengan susu biasa. Terdapat beberapa literatur mengenai susu cokelat, namun yang membahas profil sensori susu cokelat sangat sedikit. Penelitian ini bertujuan mengidentifikasi profil sensori dan emosi dari susu cokelat kemasan dengan metode CATA (Check-All-That-Apply) dan Emotional Sensory Mapping. Sampel yang digunakan yaitu 4 produk susu cokelat kemasan dengan merek yang berbeda dan menggunakan 30 panelis konsumen. Sweet aftertaste, creamy mouthfeel, viscosity mouthfeel merupakan atribut yang mempengaruhi kesukaan dan kepuasan konsumen terhadap susu cokelat. Atribut yang diinginkan ada pada produk ideal yaitu creamy mouthfeel. Atribut emosi, musik, needstate yang relatif dominan pada setiap sampel berbeda-beda. Berdasarkana CATA intensity, atribut salty taste dan sweet aftertaste memiliki korelasi positif yang berarti atribut sweet aftertaste akan meningkat intensitasnya jika atribut salty taste ditingkatkan. Rekomendasi perbaikan produk dapat dilihat berdasarkan atribut dominan dari setiap sampel dengan mengacu pada atribut liking, must have, dan atribut ideal menurut persepsi konsumen. Atribut yang termasuk dalam tiga kelompok tersebut yaitu sweet aroma, chocolate aroma, chocolate taste, aftertaste, creamy mouthfeel, viscosity mouthfeel. Oleh karena itu, dengan memahami profil sensori akan membantu industri makanan dalam mengembangkan produk susu cokelat yang ditargetkan lebih baik., Consumption of chocolate milk has increased in Indonesia, owing to increased consumer awareness of healthier lifestyles and the distinct flavor of chocolate milk compared to fresh milk. While there is some literature on chocolate milk, little is known about its sensory profile. The purpose of this study is to use the CATA (Check-All-That-Apply) and Emotional Sensory Mapping methods to determine the sensory profile and emotions of ready-to-drink chocolate milk. The samples consisted of four packaged chocolate milk products from various brands, with a total of 30 consumer panelists. The sweetness of the aftertaste, the creamy mouthfeel, and the viscosity of the mouthfeel all contribute to the liking and satisfaction with chocolate milk. The ideal product should have a creamy mouthfeel. Each sample contains a different proportion of emotion, music, and need state attributes. According to CATA intensity, the salty flavor and sweet aftertaste qualities have a positive correlation, which means that as the salty taste attribute increases, the sweet aftertaste attribute increases as well. Consumer perceptions indicate that product enhancement recommendations should be made based on the sample's dominant attributes, which include liking attributes, musthave attributes, and ideal attributes. Sweet aroma, chocolate aroma, chocolate taste, aftertaste, creamy mouthfeel, and viscosity mouthfeel are all included in the three categories. Thus, gaining a better understanding of the total sensory profile would aid food manufacturers in developing more targeted chocolate milk products.
Keyword: CATA, chocolate milk, emotional sensory mapping, sensory  evaluation

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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