Judul: Food Pairing Sensory Evaluation of Complimentary Food for Consuming Tea
Abstrak: Food pairing adalah metode ilmiah untuk mengidentifikasi makanan dan minuman mana yang cocok dikombinasikan. Penelitian secara formal mengenai food pairing di Indonesia belum dilakukan, termasuk mengenai makanan yang paling cocok jika dipadukan dengan teh sebagai minumannya. Maka dari itu, penelitian ini bertujuan meneliti mengenai food pairing, menganalisis makanan yang paling cocok sebagai pendamping minum teh, dan mengidentifikasi profil sensorinya menggunakan panelis konsumen berbasis home use test. Penelitian dilakukan dengan tahapan antara lain survei online mengenai pola konsumsi teh dan screening makanan pendamping teh yang paling diminati, kemudian dilakukan focus group discussion (FGD) untuk menentukan atribut sensori yang diujikan, dan uji sensori menggunakan metode check-all-that-apply (CATA). Hasil survey menunjukkan masyarakat menyukai teh hitam manis hangat yang dipadukan dengan biskuit. Berdasarkan analisis CATA, atribut yang diinginkan konsumen pada perpaduan yang ideal adalah buttery, creamy, gurih kelapa, sandy, dan manis. Pasangan produk yang paling mendekati ideal adalah teh dengan biskuit Roma Kelapa yang perpaduanya dapat meningkatkan rasa manis, meningkatkan mouthfeel buttery dan creamy, serta menurunkan tekstur sandy., Food pairing is a research method for identifying the suitability of certain foods and drinks for each other. No food pairing research has been conducted in Indonesia, including concerning the most appropriate food when combined with tea. Thus, this study will investigate how many different food items can be combined with tea and the characteristics of those food items. The research was carried out by stages, including an online survey of tea consumption patterns, a screening of most popular tea companion food products, a focus group discussion to determine the sensory attributes tested, and sensory tests using the check-all-that-apply (CATA) method. The survey respondents liked the combination of tea and biscuits. Based on CATA calculation. The qualities consumers seek when purchasing buttery, creamy, coconut flavored biscuits are buttery, creamy, coconut taste, sandy, and sweet. The closest product pair to the ideal is tea with Roma Kelapa. This combination will increase sweetness, increase rich mouthfeel, and reduce the sandy texture.
Keyword: CATA, food pairing, tea

Judul: Consumer Perception of Food pairing Coffee Ready to  Drink with Check All That Apply (CATA) method
Abstrak: Produk olahan kopi berkembang pesat karena menyesuaikan dengan kebutuhan konsumen. Pengembangan produk minuman kopi seperti kopi instan menjadi sangat diminati. Kopi ready to drink (RTD) adalah produk minuman kopi yang siap saji dan siap dikonsumsi sehingga dinilai lebih praktis. Kopi RTD sering dikonsumsi dengan berbagai makanan pendamping. Perpaduan pasangan makanan dan minuman seperti kopi RTD dengan makanan pendampingnya akan menghasilkan sifat sensori jika dikonsumsi secara bersamaan yang disebut dengan Food Pairing. Penelitian ini bertujuan untuk mengetahui karakteristik atribut sensori dari perpaduan kopi RTD dengan makanan pendampingnya, serta perubahan intensitas atribut sensori yang terdapat pada perpaduan kopi RTD dengan makanan pendampingnya. Penelitian ini dilakukan dengan screening awal panelis, Focus Group Discussion (FGD) untuk menentukan atribut sensori, dan pengujian sensori yang dilakukan secara Home Used Test (HUT). Respon yang didapatkan diolah menggunakan software XLSTAT dan menghasilkan profil sensori food pairing kopi RTD. Hasil pengujian menunjukkan konsumen menyukai kopi RTD yang dipasangkan dengan wafer cokelat. Profil pasangan “Kopi-Wafer Cokelat” memiliki tekstur creamy, thick, rasa sweet dan cokelat sehingga mendekati pasangan ideal berdasarkan hasil CATA, pasangan ini juga menghasilkan emosi positif seperti happy dan satisfied saat mengkonsumsinya. Profil pasangan “Kopi-Biskuit Kelapa” memiliki tekstur crunchy, rasa pahit dari kopi, coffee flavor, dan coconut flavor, pasangan ini juga menghasilkan emosi quite menurut panelis. Profil pasangan “Kopi-Keripik kentang” memiliki tekstur crispyness, rasa salty, umamy, roasted beef, dan mouthfeel oily, pasangan ini menghasilkan emosi-emosi negatif seperti bored dan flat menurut panelis. Intensitas setiap atribut pada ketiga pasangan sampel mengalami perubahan yaitu meningkat,tetap, atau menurun saat dipasangkan. Pasangan “Kopi-Wafer Cokelat” dinilai memiliki kompleksitas overall flavor yang banyak dan menghasilkan harmoni yang baik dibandingkan pasangan lainnya. Pasangan “Kopi-Wafer Cokelat” juga dinilai memiliki keseimbangan flavor yang sangat seimbang yaitu tidak ada yang saling mendominasi. Berdasarkan keseluruhan hasil data yang didapatkan, pasangan “Kopi-Wafer Cokelat” merupakan pasangan terbaik menurut panelis konsumen., Coffee products expand at the same rate as consumer needs. The cultivation of coffee beverage products such as instant coffee generates considerable interest. Ready-to-drink (RTD) coffee is a ready-to-drink coffee beverage that is convenient to consume. RTD coffee pairs well with a variety of foods. When food and beverage sets such as RTD coffee and its complementary nourishments are consumed concurrently, a sensory trait called Food Pairing occurs. The purpose of this study was to determine the sensory attribute characteristics of RTD coffee and its nourishments used CATA method, as well as the sensory attribute intensity change in RTD coffee and its nourishments with modified RATA method. The research process was carried out by initial screening of the panelists, followed by Focus Group Discussion (FGD) to determine sensory attribute and sensory testing, which was carried out using the Home Used Test (HUT). Responses were processed using statistical software XLSTAT and generated a food pairing sensory profile of RTD coffee. The results showed that consumers like RTD coffee paired with chocolate wafer. The "Coffee-Chocolate Wafer" profile features a creamy and thick texture along with a sweet and chocolate flavor, making it near-ideal food set based on CATA result, this pair also produces positive emotions such as happy and satisfied when consuming them. The "Coffee- Coconut
Keyword: Kopi RTD, Food Pairing, CATA, JAB, HUT

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model