Judul: Sensory Evaluation of 3 In 1 Instant Coffee and  Cookies with Home Use Based Test
Abstrak: Kopi instan 3 in 1 seringkali dikonsumsi bersama dengan makanan pendamping berupa makanan kecil atau snack. Penelitian ini bertujuan menentukan profil sensori yang muncul serta disukai oleh konsumen dari konsumsi kopi instan 3 in 1 dan cookies secara berpasangan (food pairing) melalui pengujian sensori serta menentukan pasangan ideal kopi instan 3 in 1- cookies dan analisis data dengan metode CATA (Check-All-That-Apply). Sampel yang akan digunakan adalah kopi instan 3 in 1 merek komersial A, kukis cokelat merek komersial B varian double choco, kukis cokelat merek komersial B varian classic, dan kukis cokelat merek komersial C varian rich chocolate. Tahapan penelitian terbagi menjadi 5 tahap utama, yaitu literature review, survei konsumen melalui kuesioner online, Focus Group Discussion (FGD), uji sensori secara food pairing berbasis home use test, dan analisis dan pengolahan data dengan metode CATA (Check-All-That-Apply) beserta pengolahan intensitas. Berdasarkan survei terhadap 400 orang responden melalui kuesioner online, snack yang paling diminati menjadi makanan pendamping kopi instan 3 in 1 adalah cookies. Profil sensori yang paling disukai oleh konsumen ketika kopi instan 3 in 1 dan cookies dikonsumsi sebagai food pairing adalah milky aroma, roasted aroma, caramel aroma, rasa asin, rasa caramel, mouthfeel creamy, dan mouthfeel viscosity. Milky aroma, mouthfeel creamy, dan mouthfeel viscosity berasosiasi dengan atribut ideal yang diinginkan konsumen. Terdapat juga atribut sweet aroma, roasted aroma, rasa milky, rasa pahit, aftertaste manis, dan aftertaste pahit yang menjadi atribut ideal yang diinginkan konsumen. Ketika dikonsumsi secara berpasangan, terdapat penurunan, kesamaan, dan peningkatan beberapa intensitas atribut sensori. Pasangan produk paling ideal menurut konsumen adalah pasangan sampel dengan kode 002, yaitu pasangan kopi instan 3 in 1 merek komersial A dengan kukis cokelat merek komersial B varian classic., This 3 in 1 instant coffee is often consumed along with side this, such as snacks. This research aims to determine the sensory profile that appears and preferred by the consumers form the consumption of 3 in 1 instant coffee - cookies as food pairing through sensory testing, determine the ideal match if 3 in 1 instant coffee and cookies, and analyze data using the CATA (Check-All-That-Apply) method with home use-based test. Samples to be used were commercial brand A for 3 in 1 instant coffee, commercial brand B in double choco variant for chocolate cookies, commercial brand B in classic variant for chocolate cookies, and commercial brand C in rich chocolate variant for chocolate cookies. This research divided into 5 main stages, namely literature review, consumers survey with online questionnaire, Focus Group Discussion (FGD), sensory evaluation by food pairing method with home use based test, and CATA (Check-All-That-Apply) data and intensity analysis. Based on survey of 400 respondents through an online questionnaire, the most preferred snack to complement 3 in 1 instant coffee was cookies. The compatibility of 3 in 1 instant coffee and cookies consumption can be done through sensory tests by means of food pairing to determine the sensory profile that appears when the two products are consumed. The sensory profile most preferred by consumers when 3 in 1 instant coffee and cookies consumed as food pairing were milky aroma, roasted aroma, caramel
Keyword: CATA, Cookies, Food Pairing, Kopi Instan 3 In 1, Profil Sensori, 3 In 1 Instant Coffee, Sensory Profile

Judul: Evaluasi Sensori Food Pairing Kopi 2 In 1 Menggunakan Metode CATA (Check-All-That-Apply)
Abstrak: Kopi 2 in 1 merupakan kopi hitam yang hanya ditambahkan gula dan dikemas dalam kemasan sachet. Penelitian ini bertujuan untuk mengetahui karakteristik atribut sensori kopi 2 in 1 yang dipadukan dengan bakwan, biskuit, pisang goreng, dan roti tawar menggunakan panelis konsumen dengan metode CATA (Check-All-ThatApply). Kopi tubruk maupun kopi instan umumnya dikonsumsi dengan makanan yang tidak mengenyangkan, seperti bakwan, biskuit, pisang goreng, dan roti tawar. Tahapan penelitian ini terbagi menjadi sepuluh tahap yaitu literature review, perancangan survei, survei pendahuluan, pengujian kuesioner, survei konsumen, FGD, persiapan sampel uji, pengujian sampel, pengolahan data menggunakan XLSTAT, dan penarikan simpulan mengenai pasangan makanan dan minuman yang cocok. Survei konsumen dengan 401 responden menghasilkan persentase pasangan makanan dan kopi 2 in 1. Pasangan kopi 2 in 1 dengan sampel makanan yang cocok dapat diuji melalui evaluasi sensori yang berkaitan dengan food pairing. Atribut setiap pasangan didapatkan dari FGD. Berdasarkan analisis CATA, atribut yang berpengaruh terhadap kesukaan panelis yaitu rasa kelapa, tekstur lebur, dan mouthfeel sandy. Hasil dari analisis CATA dan tabulasi hasil kecocokan, sampel yang cocok dipadukan yaitu kopi 2 in 1 dengan biskuit.
Keyword: 2 in 1 coffee, biscuit, CATA, coffee, food pairing, sensory

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