Judul: Customer Satisfaction of Instant Sajiku Seasonings
Abstrak: PT Ajinomoto Indonesia merupakan salah satu perusahaan yang mengambil peluang pangsa pasar bumbu instan di Indonesia dengan produknya yaitu bumbu instan Sajiku. Berdasarkan hasil top brand index dari tahun 2018 sampai 2022, terdapat adanya penurunan penilaian konsumen terhadap produk bumbu instan Sajiku selama empat tahun berturut-turut. Perlu adanya upaya peningkatan kualitas produk bumbu Sajiku agar dapat memenuhi kebutuhan kosumen dan dapat bersaing dengan produk bumbu instan lainnya. Tujuan penelitian ini adalah mengidentifikasi karakteristik konsumen dan proses keputusan pembelian serta menganalisis kepuasan konsumen bumbu instan Sajiku. Penelitian ini menggunakan data primer dari survei daring dan luring dengan 168 responden menggunakan metode purposive sampling. Data dianalisis menggunakan analisis deskriptif, customer satisfaction index (CSI) dan importance performance analysis (IPA). Karakteristik konsumen bumbu instan Sajiku secara umum adalah perempuan berusia 26-35 tahun dan bekerja sebagai pegawai swasta. Berdasarkan analisis CSI, tingkat kepuasan konsumen terhadap atribut bumbu Sajiku adalah 82,41%. Hasil analisis IPA menunjukan bahwa promosi, varian rasa dan ketersediaan produk merupakan prioritas utama yang harus diperbaiki untuk meningkatkan kepuasan konsumen., PT Ajinomoto Indonesia is one of the companies that take the opportunity of instant seasoning market share in Indonesia with its product, namely Sajiku instant seasoning. Based on the results of the top brand index from 2018 to 2022, there has been a decrease in consumer appraisal of Sajiku instant seasoning products for four years. Actions are needed to improve the quality of Sajiku seasoning products in order to meet the needs of consumers and be able to compete with other instant seasoning products. The purpose of this study was to identify consumer characteristics and purchasing decision processes and analyze consumer satisfaction of Sajiku instant seasoning. This study used primary data from an online and offline survey of 168 respondents using purposive sampling method. Data were analyzed using descriptive analysis, customer satisfaction index (CSI) and importance performance analysis (IPA). The characteristics of Sajiku instant seasoning consumers in general are women aged 26-35 years and working as private employees. Based on CSI's analysis, the level of consumer satisfaction with Sajiku's seasoning attributes is 82.41%. The results of the IPA analysis show that promotion, flavor variants and product availability are the top priorities that must be improved to increase consumer satisfaction.
Keyword: consumer satisfaction, CSI, instant seasoning, IPA

Judul: Consumer Preferences Mapping for Instant Noodle: Case Study Indomie
Abstrak: Mi instan sangat diminati di Indonesia. Masyarakat perkotaan seperti Jabodetabek (Jakarta, Bogor, Depok, Tangerang, dan Bekasi) sering mengonsumsi makanan instan, salah satunya adalah mi instan. Penelitian ini bertujuan mendapatkan peta preferensi konsumen terhadap mi instan di Jabodetabek yang terdiri dari tingkat kepentingan dan kinerja, mengetahui atribut yang mampu memuaskan responden, mendapatkan informasi mengenai profil sensori serta intensitasnya, dan tingkat kesukaan yang dapat dijadikan acuan untuk memperbaiki atau mengembangkan produk mi instan. Metode yang digunakan adalah importance performance analysis (IPA), gap analysis, serta pengujian sensori dengan metode Rate-All-That-Apply (RATA) dan rating hedonik. Sampel yang digunakan adalah mi dengan varian rasa goreng original, kari ayam, dan soto mi. Atribut dengan nilai rata-rata kepentingan, kinerja, dan harapan tertinggi adalah rasa, izin edar, dan sertifikat halal produk. Atribut ‘memiliki sertifikat halal’ pada produk Indomie mampu memuaskan responden. Pada pengujian sensori dengan metode RATA, sampel goreng original didominasi oleh atribut pedas, aroma kecap, rasa manis, oily aftertaste, dan glossy. Sampel kari ayam didominasi oleh atribut aroma kari, tekstur lembut dan licin, serta rasa asin. Sampel soto mi didominasi oleh atribut rasa asam, rasa umami, warna kuning, aroma soto, dan tekstur kenyal. Varian rasa goreng original merupakan varian rasa yang paling disukai oleh responden dan panelis., Instant noodles are greatly desired in Indonesia. Communities in Jabodetabek (Jakarta, Bogor, Depok, Tangerang, and Bekasi) often consume instant food, such as instant noodles. This study aims to obtain a consumer preference map for instant noodles in Jabodetabek which consist of importance and performance level, to know the attributes that are able to satisfy the respondents, as well as the sensory profile and preference level of the product which can be used for improving and developing instant noodle products. The method used consists of importance-performance analysis (IPA), gap analysis, and sensory testing using the Rate-All-That-Apply (RATA) and hedonic rating methods. Fried original, chicken curry, and soto mi were the three instant noodle flavor variants used as samples. The attributes that have the highest average value in importance, performance, and expectations are taste, marketing authorization, and product halal certificate. The attribute of “halal certificate product” on Indomie is able to satisfy the respondents. In sensory testing using the RATA method, the original fried sample was dominated by spicy, soy sauce aroma, sweet taste, oily aftertaste, and glossy attributes. The chicken curry sample was dominated by curry aroma, soft texture, slippery texture, and salty taste attributes. Soto mi sample was dominated by sour taste, umami taste, and yellow color, soto aroma, and springy texture attributes. The original fried flavor was the most preferred by respondents and panelists.
Keyword: consumer preferences, gap analysis, instant noodle, IPA, RATA

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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