Judul: Pengaruh Kualitas Pelayanan Gojek dalam Menerapkan Protokol Kesehatan J3K terhadap Kepuasan dan Loyalitas Pelanggan
Abstrak: Indonesia menjadi salah satu negara yang terdampak pandemi Covid-19. Tingginya kasus terkonfirmasi di Indonesia menyebabkan Indonesia harus melaksanakan Pembatasan Sosial Berskala Besar (PSBB). Sehingga segala kegiatan hanya bisa dilakukan dari rumah saja. Gojek sebuah perusahaan transportasi on-demand melakukan inovasi dengan membuat kampanye protokol kesehatan J3K. J3K berarti jaga kesehatan, jaga kebersihan, dan jaga keamanan. J3K merupakan upaya Gojek dalam meningkatkan kualitas pelayanan Gojek. Penelitian ini bertujuan untuk menganalisis pengaruh kualitas pelayanan Gojek dalam menerapkan protokol kesehatan J3K terhadap kepuasan dan loyalitas pelanggan. Penelitian dilakukan dari bulan Juni sampai Agustus 2021 kepada pengguna layanan Gojek di DKI Jakarta. Teknik penentuan sampel menggunakan voluntary sampling. Teknik analisis data yang digunakan adalah analisis deskriptif dan structural equational modelling-partial least square (SEM PLS). Hasil penelitian menunjukkan bahwa kualitas pelayanan berpengaruh pada kepuasan pelanggan dan loyalitas pelanggan pada layanan Gojek dalam menerapkan protokol kesehatan J3K, serta kepuasan pelanggan berpengaruh pada loyalitas pelanggan. Hal ini berarti kualitas pelayanan Gojek dalam menerapkan protokol kesehatan J3K mampu melebihi ekspektasi pelanggan dan mampu membangun loyalitas bagi pelanggan., Indonesia is one of the countries affected by the Covid-19 pandemic. The high number of confirmed cases in Indonesia has forced Indonesia to implement Large-Scale Social Restrictions (PSBB). So that all activities can only be done from home. Gojek, an on-demand transportation company, innovates by creating a J3K health protocol campaign. J3K means taking care of your health, keeping it clean, and keeping it safe. J3K is Gojek's effort to improve the quality of Gojek's services. This study aims to analyze the effect of Gojek's service quality in J3K health protocol implementation toward customer satisfaction and loyalty. The research was conducted from June to August 2021 with Gojek’s customers in DKI Jakarta. The voluntary sampling was used as sampling methode. The data analysis technique used descriptive analysis and structural equational modeling-partial least square (SEM PLS). The results showed that service quality affected customer satisfaction and loyalty to Gojek services in implementing the J3K health protocol, then customer satisfaction affected on customer loyalty. This means Gojek’s service quality in implementing J3K health protokol that be able to increase customer expectation and also be able to create the customer loyalty.
Keyword: Customer satisfaction, Customer loyalty, Gojek, Health protocol, Service quality

Judul: The Effect of GoRide Instant Service Quality on Purchase Decision and Customer Loyalty for Gojek Users at Bogor Station
Abstrak: Semakin berkembangnya peradaban menyebabkan semakin bertambahnya mobilisasi yang dilakukan manusia. Perkembangan teknologi transportasi dan komunikasi, memungkinkan konsumen di era ini mempunyai kesempatan untuk memilih berbagai jenis transportasi yang ditawarkan. GoRide Instant merupakan salah satu metode pemesanan untuk layanan GoRide yang di sediakan kepada konsumen oleh Gojek sebagai salah satu perusahaan penyedia transportasi online di Indonesia. Penelitian ini dilakukan dari April 2023 hingga Agustus 2023 melalui pengisian kuesioner secara online dan ditujukan untuk mengkaji pengaruh kualitas layanan GoRide Instant terhadap purchase decision dan customer loyalty pada pengguna Gojek di Stasiun Bogor. Data yang digunakan dalam penelitian ini adalah data primer dan data sekunder yang dianalisis menggunakan Structural Equation Modelling (SEM) dengan sampel sebanyak 303 responden. Teknik yang digunakan dalam pengambilan sampel adalah metode non-probability sampling jenis purposive sampling. Hasil penelitian ini menunjukkan bahwa kualitas layanan GoRide Instant berpengaruh positif dan signifikan terhadap purchase decision dan customer loyalty pada pengguna Gojek di Stasiun Bogor., The development of civilization causes more and more mobilization by humans. Developments in transportation and communication technology, enabling consumers in this era have the opportunity to choose various types of transportation offered. GoRide Instant is an ordering method for GoRide services provided to consumers by Gojek an online transportation provider company in Indonesia. This research was conducted from April 2023 to August 2023 by filling out an online questionnaire and aimed to examine the effect of GoRide Instant service quality on purchase decisions and customer loyalty of Gojek users at Bogor Station. The data used in this study are primary data and secondary data which were analyzed using Structural Equation Modeling (SEM) with a sample of 303 respondents. The sampling technique used is a non-probability sampling method, named purposive sampling. The results of this study indicated that the quality of GoRide Instant service has a positive and significant effect on purchasing decisions and customer loyalty of Gojek users at Bogor Station.
Keyword: customer loyalty, online transportation, purchase decision, Structural Equation Modelling (SEM), service quality

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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