Judul: Pengaruh Mutu Produk, Harga dan Promosi terhadap Keputusan Pembelian Celana Jeans Merek Fallas di Fallas Fashion Tanah Abang
Abstrak: Pakaian merupakan kebutuhan primer bagi manusia yang harus dipenuhi. PT Fallasindo Utama Garmen merupakan perusahaan lokal di bidang industri pakaian jadi menyediakan produk celana jeans. Penelitian bertujuan menganalisis pengaruh dari mutu produk, harga dan promosi terhadap keputusan pembelian Celana Jeans Merek Fallas di Fallas Fashion Tanah Abang. Penelitian terdiri dari data primer dan sekunder. Data primer diperoleh melalui hasil wawancara dan kuesioner dari 103 responden dengan teknik pengambilan contoh purposive sampling. Data sekunder diperoleh dari studi literatur yang relevan. Alat analisis data adalah analisis regresi linear berganda. Hasil penelitian menunjukkan peubah mutu produk, harga dan promosi secara simultan berpengaruh terhadap keputusan pembelian. Secara parsial peubah mutu produk, harga dan promosi memiliki pengaruh nyata dan positif terhadap keputusan pembelian. Hal ini menunjukkan bahwa semua peubah dalam penelitian, yaitu mutu produk, harga dan promosi berpengaruh terhadap keputusan pembelian.
Keyword: Celana jeans Fallas, Harga, Keputusan pembelian, Mutu Produk, Promosi

Judul: Sustainable Apparel Product Purchase Decisions on Indonesian Gen Z and Millennial Women Consumers
Abstrak: Fashion trends continue to change, sustainable and fast fashion brands continue to compete to provide diverse choices for consumers. This study aims to: (1) identify the characteristics of Indonesian Gen Z and millennial women consumers of sustainable apparel products, (2) analyze the influence of sustainable product attributes and marketing factors on sustainable apparel purchasing decisions (3) analyze the influence of individual and social factors on sustainable apparel purchasing decisions using the theory of planned behaviour. The sample in this study was 77 respondents selected by convenience sampling technique. Data analysis was carried out using the SEM-PLS method and descriptive analysis. The results showed that individual factor perceived behavioural control and social factor subjective norms had a positive and significant effect, sustainable product attributes, and marketing factors had a positive but not significant effect, and individual factors attitude had a negative but weak and insignificant effect on purchasing decisions for sustainable apparel products., Tren feysen terus berganti, brand sustainable dan fast fashion terus bersaing untuk memberikan pilihan yang beragam bagi konsumen. Penelitian ini bertujuan untuk: (1) mengidentifikasi karakteristik konsumen wanita produk pakaian berkelanjutan gen Z dan milenial Indonesia, (2) menganalisis pengaruh atribut dan pemasaran produk berkelanjutan terhadap keputusan pembelian pakaian berkelanjutan, dan (3) menganalisis pengaruh faktor individu dan sosial terhadap keputusan pembelian pakaian berkelanjutan menggunakan variabel theory of planned behavior. Sampel pada penelitian ini berjumlah 77 responden yang dipilih dengan teknik convenience sampling. Analisis data dilakukan menggunakan metode SEM-PLS dan analisis deskriptif. Hasil penelitian menunjukkan bahwa faktor individu pengendalian perilaku dan faktor sosial norma subjektif berpengaruh positif dan signifikan, faktor atribut dan pemasaran produk berkelanjutan berpengaruh positif namun tidak signifikan dan faktor individu sikap berpengaruh negatif namun lemah dan tidak signifikan terhadap pengambilan keputusan pembelian produk pakaian berkelanjutan.
Keyword: product attributes and marketing, purchase decision, SEM-PLS, sustainable apparel product, theory of planned behavior

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