Judul: Analisis Isi Iklan Produk dengan Klaim Hijau pada Surat Kabar
Abstrak: The aim of this study was to analyze the contents of newspaper advertisements which use green claim using content analysis method. There are four variables which have been analyzed, kind of product, characteristics of newspaper advertisements, message appeals, and green claim which comprises key term and nature of claim. Analyzed advertisements took from Harian Kompas in a period from December 1st 2012 until January 31st 2013. Furthermore, those advertisements evaluated by Undang-undang Perlindungan Konsumen No. 8 Tahun 1999 (UUPK) and Etika Pariwara Indonesia (EPI). An evaluation shows that there are only 3 advertisements fulfilled Undang-undang Perlindungan Konsumen‟s advertising standards, 77 advertisements fulfilled Etika Pariwara Indonesia‟s advertising standards and only 2 advertisements fulfilled both standards. Descriptive analysis showed that there are 73 advertisements had objective green claim. A managerial implication of this research is requirement to producer to pay more attention toward advertisement certainty in order to increasing consumer welfare.
Keyword: standard, UUPK, content analysis, consumer welfare, EPI

Judul: Content Analysis of Furniture Product Promotion with Environmental Claims on Instagram
Abstrak: Peningkatan kesadaran masyarakat mengenai lingkungan mendorong perusahaan menerapkan konsep ramah lingkungan dan mengklaim produknya ramah lingkungan, salah satunya pada produk furnitur. Penelitian ini bertujuan untuk menganalisis karakteristik produk, unggahan promosi, dan karakteristik klaim hijau pada promosi produk furnitur serta pemenuhannya terhadap UUPK. Penelitian dilakukan dengan menganalisis isi 200 unggahan promosi produk furnitur dengan klaim hijau di Instagram. Data diolah secara deskriptif menggunakan IBM SPSS Statistic 25.0 dan Voyant Tools. Hasil analisis menunjukkan bahwa unggahan paling banyak memiliki elemen bahan ramah lingkungan (78%), bersifat subjektif (60,5%), berorientasi produk (85,5%) dan terkategori ambigu (65%). Analisis terhadap UUPK menunjukkan bahwa pasal 9 merupakan pasal yang paling banyak (59,5%) dilanggar oleh pelaku usaha. Perlu adanya kerjasama antara konsumen, pelaku usaha serta pemerintah untuk mengurangi peredaran klaim hijau yang mengelabui pada promosi produk furnitur., Increasing public awareness about the environment has pushed companies to apply green concept and claim their products as environmentally friendly, such as furniture products. This study analyzes product characteristics, promotional posts, and characteristics of claims in furniture product promotion uploads with green claims on Instagram and its fulfillment of Law of Consumer Protection. The study was conducted by analyzing 200 promotional uploads of furniture products with green claims on Instagram. The data was processed descriptively using IBM SPSS Statistics 25.0 and Voyant Tools. The results indicate that the uploads contain the most elements of environmentally friendly materials (78%), are subjective (60.5%), product-oriented (85.5%), and are categorized as ambiguous (65%). Analysis of the UUPK shows that article 9 is the article with the most (59.5%) violated by business actors. It requires cooperation between consumers, business actors and the government to reduce the spread of deceptive green claims on furniture product promotions.
Keyword: consumer protection, content analysis, environmental claims, furniture, instagram

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