Judul: Feasibility Analysis of Household Plastic Waste Management and Processing into Paving Blocks (Case Study: Kebon Kopi Village, Cibanteng Village, Bogor Regency)
Abstrak: Rumah tangga yang terletak di Kampung Kebon Kopi terbiasa membakar sampah plastik akibat tidak adanya Tempat Pembuangan Akhir Sementara (TPAS). Untuk itu, kegiatan pengangkutan sampah plastik rumah tangga untuk diolah menjadi paving block merupakan salah satu bentuk implementasi konsep 3R (Reduce, Reuse, Recycle) yang dapat mengatasi permasalahan tersebut. Penelitian ini bertujuan untuk mengestimasi kesediaan masyarakat membayar jasa pengelolaan (iuran) sampah plastik rumah tangga, menganalisis kelayakan finansial agar usaha yang dilakukan dapat berjalan secara layak, serta mengetahui dampak ekonomi dan lingkungan yang dapat timbul. Metode yang digunakan meliputi Contingent Valuation Method (CVM) melalui Willingness to Pay (WTP), analisis kelayakan usaha dengan Net Present Value (NPV), Net Benefit Cost Ratio (BCR), Internal Rate of Return (IRR), dan Payback Period (PP) sebagai indikator, serta analisis deksriptif. Hasil penelitian mengindikasikan bahwa nilai rata-rata WTP rumah tangga belum mampu untuk mendorong mereka melakukan pemilahan sampah, sehingga penetapan iuran berdasarkan nilai WTP minimum dipilih sebagai alternatif yang paling sesuai. Selain itu, hasil analisis kelayakan finansial skenario II dengan menerapkan iuran pengangkutan sampah rumah tangga menunjukkan bahwa proyek pengolahan sampah plastik menjadi paving block layak dijalankan. Terdapat juga potensi dampak yang timbul berupa munculnya lapangan kerja baru dan pengurangan emisi di udara., Households in Kebon Kopi Village are accustomed to burning plastic waste due to the absence of a Temporary Final Disposal Site (TPAS). Therefore, the activity of transporting household plastic waste to be processed into paving blocks is one form of implementing the concept of 3R (Reduce, Reuse, Recycle) that can address this problem. This research aims to estimate the willingness of the community to pay for household plastic waste management services (fees), analyze the financial feasibility to ensure that the business conducted can operate properly, and identify the potential economic and environmental impacts. The methods used include the Contingent Valuation Method (CVM) through Willingness to Pay (WTP), business feasibility analysis using Net Present Value (NPV), Net Benefit Cost Ratio (BCR), Internal Rate of Return (IRR), and Payback Period (PP) as indicators, as well as descriptive analysis. The research results indicate that the average value of WTP of households is not yet able to encourage them to sort waste, so the determination of fees based on the minimum WTP value is chosen as the most appropriate alternative. Furthermore, the results of the financial feasibility analysis for scenario II which includes the implementation of household waste transportation fees indicate that the project of processing plastic waste into paving blocks is feasible. There is also the potential for impacts such as the emergence of new job opportunities and the reduction of air emissions.
Keyword: Dampak Ekonomi, Dampak Lingkungan, Iuran Sampah Rumah Tangga, Kelayakan Finansial, Economic Impact, Environmental Impact, Household Waste Fees, Inancial Feasibility

Judul: Analysis of Added Value and Communities Perception of Plastic Waste Management Conducted by CV. Kastubi Berkah
Abstrak: CV. Kastubi Berkah merupakan bidang usaha sekaligus fasilitator bagi masyarakat dalam pengelolaan sampah plastik (recycling). Keberadaan perusahaan ini dapat memberikan pengaruh kepada masyarakat mengenai pengelolaan sampah plastik sehingga dapat tercipta konsep pengelolaan sampah yang baik yaitu adanya partisipasi masyarakat dan pengelolaan sampah yang mendekati rumah tangga. Berdasarkan hal tersebut, penelitian ini bertujuan untuk (1) menganalisis sistem rantai nilai daur ulang sampah plastik, (2) menganalisis persepsi masyarakat terhadap pengelolaan sampah plastik menjadi produk cacahan plastik, dan (3) mengestimasi besarnya nilai tambah dari sampah plastik menjadi produk cacahan plastik. Metode yang digunakan yaitu analisis rantai nilai teori Porter, analisis nilai tambah metode Hayami, dan analisis deskriptif kuantitatif dengan skala likert. Hasil penelitian ini menunjukkan biaya penyediaan bahan baku Rp552.000,00, kegiatan operasi Rp13.950.000, dan logistik keluar Rp958.000,00. Masyarakat merasakan dampak pengelolaan sampah plastik perusahaan dari aspek sosial dan lingkungan, tetapi belum merasakan dampak dari aspek ekonomi. Nilai tambah terbesar dihasilkan oleh produk PP PK yaitu sebesar Rp4.209,37 per kg., CV. Kastubi Berkah is a business sector as well as a facilitator for the community in plastic waste management (recycling). The existence of this company can have an influence on the community regarding plastic waste management so that a good waste management concept can be created, namely community participation and waste management approaching households. Based on this, this study aims to (1) analyze the plastic waste recycling value chain system, (2) analyze public perceptions of the management of plastic waste into shredded plastic products, and (3) estimate the value added of plastic waste into shredded plastic products. The methods used are value chain analysis of Porter's theory, value added analysis of the Hayami method, and quantitative descriptive analysis with a Likert scale. The results of this study indicate that the cost of providing raw materials is IDR 552,000.00, operating activities are IDR 13.95 million, and outbound logistics is IDR 958,000.00. The community feels the impact of the company's plastic waste management from social and environmental aspects, but has not yet felt the impact from the economic aspect. The biggest added value was generated by PP PK products, which was IDR 4,209.37/kg.
Keyword: added value, perception, plastic waste, value chain

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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