Judul: Sensory Evaluation Instant chocolate powdered drink with CATA (Check-All-That-Apply), Emotional Sensory and IPM (Ideal Profile Method) methods.
Abstrak: Minuman serbuk instan coklat merupakan produk olahan coklat yang cukup digemari di Indonesia sehingga menarik minat beberapa perusahaan untuk mengembangkan produk tersebut. Pengembangan produk dapat dilakukan melalui aspek sensori dan emosi yang mempengaruhi keputusan konsumen untuk membeli produk. Selain kedua aspek tersebut, branding yang disukai dan dapat menonjolkan ciri khas produk akan memberikan nilai tambah terhadap produk. Untuk memperoleh ketiga aspek tersebut dapat dilakukan evaluasi sensori berbasis konsumen melalui metode CATA (Check-All-That-Apply) dan IPM (Ideal Profile Method). Penelitian ini bertujuan mengindentifikasi profil sensori dan emosi, serta menentukan warna, jenis musik, dan keadaan lingkungan yang berasosiasi terhadap flavor produk untuk mengembangkan produk ideal dan branding yang disukai konsumen. Metode CATA digunakan untuk memperoleh profil sensori dan emosi (Emotional mapping sensory) produk serta memperoleh profil jenis musik, warna dan lingkungan yang berasosiasi terhadap flavor setiap produk. Metode IPM digunakan untuk mengembangkan produk dengan mengoptimalkan atribut sensori yang ideal menurut konsumen. Sampel yang digunakan sebanyak 5 variasi minuman serbuk instan rasa coklat yang beredar dipasaran Indonesia. Profil produk minuman serbuk instan coklat yang paling disukai konsumen berdasarkan hasil CATA adalah salty, chocolate, chocolate flavor, mouth coating, toasted flavor, dan dense, dengan atribut warna barn red, atribut musik blues dan pop, atribut keadan lingkungan cold, dan atribut emosi satidfied, confident dan energetic. Profil ideal sensori yang termasuk ke dalam kategori must have yang harus dimiliki suatu produk ideal adalah bitter, milky, mouth coating, dan viscosity. Hasil uji IPM menunjukan produk C, D dan E mendekati karakteristik produk ideal dimana diperlukan peningkatan atribut bitter dan penurunan viscosity, milky, mouth coating pada produk C, peningkatan seluruh atribut pada produk D dan pada produk E atribut bitter, mouth coating dan viscosity perlu ditingkatkan, sedangkan atribut milky perlu diturunkan intesitasnya.
Keyword: Check-All-That-Apply, Ideal Profile Method, Sensory Evaluation, Emotional mapping sensory, Instant Chocolate Powdered Drink

Judul: Pengembangan Minuman Cokelat Instan Komersial Menggunakan Atribut Sensori Terpilih Berdasarkan Preferensi Konsumen
Abstrak: Cacao is one of important commodity in Indonesia. Based on statistical data on 2020, export value of cacao beans reaches US$ 1,22 billion. Application of cacao beans is used as raw material for making chocolate drink. Some industries in Indonesia are developing instant commercial chocolate drink. Sensory evaluation is a key point for developing new product to meet with consumer criteria. Liking is not enough to evaluate sensory quality of the product. However, consumer satisfaction must be considered in sensory evaluation so that the product will be purchased continuously by customer. This research is the first step in development of instant commercial chocolate drink. Objective of this study are identifying consumer preference about instant chocolate drink product from market, identifying sensory attributes that are able to consumer satisfaction and their combination to improve the reach and consumer frequency. Relationship between sensory appeals and consumer satisfaction was identified by survey method integrated with structural equation model (SEM). Focus group discussion (FGD) method was utilized to identify sensory attributes of commercial instan chocolate drink. Then, Kano method is used to categorize the selected sensory attributes based on consumer satisfaction. Total unduplicated reach and frequency (TURF) method is used then to evaluate selected sensory attributes based on reach and frequency. Sensory attributes appeal affected consumer satisfaction of commercial instant chocolate drink with linear coefficient value 0,7. Better performance of sensory attributes increased consumer satisfaction. Sensory attributes of commercial instant chocolate drink consist of six groups including taste, flavor, aroma, texture, aftertaste and color. Based on Kano categorization, creamy and dark chocolate color were included in attractive category, chocolate attributes (color, aroma, flavor) were include in one-dimensional category, and sweet was included in must-be category. Furthermore, the combination of several selected attributes can be an alternative to maximize the production line. The combination of two variants flavor such as original chocolate flavor and chocolate with almonds flavor can be an alternative to reach 100% of the target market.
Keyword: chocolate drink, Kano, SEM, TURF, sensory evaluation

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