Judul: The Impact of Service Quality and Customer Satisfaction on Repurchase Intentions for Self-Employed Participants in BPJS Ketenagakerjaan.
Abstrak: Despite being required by Regulation of the Minister of Manpower of the Republic of Indonesia Number 1 of 2016, BPJS Ketenagakerjaan faces difficulties in maintaining active participation in the self-employed sector because registration is based on each person's awareness and there are no penalties for failing to pay contributions, which results in a large number of self-employed participants who are not committed to doing so. The purpose of this study is to ascertain the relationship between service quality and employee competencies, product innovation, benefits, and price. To analyzie how service quality affect customer satisfaction and the last question is whether service quality indirectly influences repurchase intention through customer satisfaction. The product innovations described in this research are ones that enhance participant services in order to raise brand awareness for BPJS Ketenagakerjaan and simplify the process for participants to make contribution payments. The examples of these innovations include offering discounts to BPJS Ketenagakerjaan cardholders at cooperation merchants and continuing to expand payment options. In the West Nusa Tenggara region, which included West Nusa Tenggara, Central Lombok, East Lombok, Sumbawa, and Bima branch offices, 200 BPJS Employment participants were surveyed for the study. SEM analysis is the analytical technique used. Only product innovation, according to the findings, had a negligible impact on service quality. This is because the needs of participants who are self-employed in the Co-Marketing program are not primarily met by merchant cooperation, so it is expected that BPJS Ketenagakerjaan will be able to increase merchant cooperation in the future to meet the needs of participants who are self-employed. BPJS Ketenagakerjaan keeps working to ensure that all participants can pay at anytime, anywhere, thus employees have to socialize about this in order for participants to be aware of and use the new payment channels. Although the West Nusa Tenggara branch of BPJS Ketenagakerjaan participants still prefer to make payments conventionally through banks, it is expected that in the future, digital-based payment channels like e-commerce applications, minimarket outlets, and also EDC/BRILink machines that have been provided, will be further optimized in order to maintain sustainability. contribution. The traits of the West Nusa Tenggara population, which are still strongly correlated with the use of local languages, can also be cause for concern. Making brochures, forms, and program explanations in local languages can be implemented so that there are no language barriers that might obstruct learning and socialization. According to the study's findings, the relationship between service quality and intention to repurchase is mediated by customer satisfaction. Customer satisfaction has an indirect impact on service quality, which affects the possibility of repeated purchases. Additionally, it means that repurchase intentions rise as service quality improves, but first through increased customer satisfaction. It won't have an impact on consumers' intentions to make another purchase even if they are not satisfied.
Keyword: Benefit, Customer Satisfaction, Employee Competencies, Price, Product Innovation, Repurchase Intention

Judul: Analysis of Job Satisfaction and Employee Engagement in BPJS Ketenagakerjaan.
Abstrak: PT Jamsostek (Persero) adalah Badan Usaha Milik Negara yang mengelola dana peserta (tenaga kerja) untuk program Jaminan Sosial Tenaga Kerja. Ketika bertransformasi menjadi BPJS Ketenagakerjaan, organisasi ini menjadi Badan Hukum Publik yang bertanggung jawab langsung kepada Presiden. Transformasi ini menyebabkan perubahan dalam beberapa faktor, di antaranya luasan (coverage). Penelitian ini bertujuan (1) menganalisis kondisi kepuasan kerja dan employee engagement karyawan berlaku di BPJS Ketenagakerjaan, (2) Menganalisis perbedaan kepuasan dan engagement pada karyawan antara kantor pusat dan kantor wilayah (3) menganalisis hubungan kepuasan kerja dan employee engagement pada BPJS Ketenagakerjaan. Metode pengolahan dan analisis data yang akan digunakan adalah Analisis Deskriptif, uji mann-whitney , dan analisis korelasi spearman rank. Hasil pada penelitian menunjukkan terdapat persamaan karyawan yang puas dan engaged antara kantor pusat dan kantor wilayah serta bahwa hubungan antara kepuasan kerja dan employee engagement bernilai positif yang dapat disimpulkan bahwa kepuasan kerja dan employee engagement hubungan yang searah dan sangat kuat, PT Jamsostek (Persero) is a state owned enterprise that manages the funds of the participant (labor) for the Social Security Program of labour. When transforming into BPJS employment, this organization becomes a public legal entity responsible directly to the President. This transformation causes changes in several factors, including extention. The research purpose to (1) To Analyze the conditions of job satisfaction and employee engagement at BPJS Ketenagakerjaan, (2) ) To Analyze employee satisfaction and engagement between the head office and regional offices (3) to analyze the relationship between job satisfaction and employee engagement at BPJS Ketenagakerjaan. Data processing and analysis methods will used are descriptive analysis, Mann-Whitney test and spearman rank correlation.The results the similarity of satisfied and involved employees between the head office and regional offices as well showed that there is and that the relationship between job satisfaction and employee engagement is positive, it can be concluded that the job satisfaction and employee engagement a unidirectional and very strong relationship.
Keyword: employee engagement, job satisfaction, mann-whitney, spearman rank

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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