Judul: Analysis of Beverage Inventory Control at PT XYZ Dramaga, Bogor Regency
Abstrak: Pertumbuhan pasar teh dan boba di Indonesia sedang mengalami pertumbuhan yang cepat. Salah satu merk teh dan boba yaitu PT XYZ yang memiliki cabang di Dramaga. Saat ini cabang tersebut mengalami kendala dalam mengelola persediaan karena permintaan yang fluktuatif tiap bulannya. Fokus pada penelitian ini adalah mengelola persediaan dari Choco Lava Milo dan Mango Yakult karena permintaannya yang cukup tinggi. Tahap awal dilakukan peramalan sebagai dasar untuk mengendalikan persediaan. Perhitungan persediaan dilakukan dengan Economic Order Quantity (EOQ). Metode peramalan yang dipilih adalah trend analysis karena tingkat kesalahannya terkecil. Berdasarkan hasil EOQ, kuantitas pemesanan optimum untuk Choco Lava Milo sebanyak 241 cup dan Mango Yakult sebanyak 244 cup. Total biaya persediaan yang dikeluarkan dengan EOQ adalah Rp3.367.898 sehingga gerai dapat menghemat biaya sebesar Rp 399.664 per tahun., The growth of the tea and boba market in Indonesia is experiencing rapid growth. One of the tea and boba brands is PT XYZ which has a branch in Dramaga. Currently, the branch is experiencing problems in managing inventory due to fluctuating demand every month. The focus of this research is managing the supply of Choco Lava Milo and Mango Yakult because demand is quite high. The initial stage is forecasting as a basis for controlling inventory. Inventory calculations are carried out using Economic Order Quantity (EOQ). The forecasting method chosen is trend analysis because the error rate is the smallest. Based on the EOQ results, the optimum order quantity for Choco Lava Milo is 241 cups and Mango Yakult is 244 cups. The total inventory costs incurred with EOQ are IDR 3.367.898 so the outlet can save costs of IDR 399.664 per year.
Keyword: Demand forecasting,, inventory control, EOQ, safety stock, Reorder Point

Judul: Analysis of Elementary School Textbook  Inventory Control at PT XYZ
Abstrak: PT XYZ merupakan salah satu perusahaan distributor buku pelajaran pendidikan dasar dan menengah yang berlokasi di Kota Depok Provinsi Jawa Barat. Perusahaan tersebut mengalami permasalahan persediaan berupa tidak terpenuhinya permintaan konsumen, kelebihan persediaan, dan tingginya biaya persediaan. Oleh karena itu, tujuan penelitian ini adalah mengkaji pengelompokkan prioritas jenis buku; menganalisis kondisi eksisting pengendalian persediaan; menganalisis persediaan optimum; dan membandingkan pengendalian persedian di perusahaan dengan metode yang diusulkan. Penelitian ini dilaksanakan sejak Januari 2023 sampai Mei 2023. Metode penelitian menggunakan analisis ABC dan Economic Order Quantity (EOQ). Jenis data berupa data primer dan data sekunder. Data primer diperoleh dari wawancara dan data sekunder diperoleh dari studi literatur. Analisis ABC menunjukkan PT XYZ memiliki 9 jenis buku yang tergolong kelas A. Pengendalian persediaan menggunakan metode EOQ menghasilkan pemesanan rata-rata sebanyak 10 kali dengan kuantitas pemesanan per tahun sebesar 126.022 eksemplar. Metode EOQ menghasilkan penghematan biaya sebesar Rp165.186.141 atau 59,16% dari total biaya persediaan perusahaan., PT XYZ is a primary and secondary education textbook distributor company located in Depok City, West Java Province. The company was facing inventory problems such as unfulfilled consumer demand, excess inventory, and high inventory costs. Therefore, the purposes of this research were examined the priority grouping of various types of books; analyzed the existing condition of inventory control; analyzed the optimum inventory; and compared inventory control with the proposed method. The research started from January 2023 until May 2023. The research method used ABC analysis and Economic Order Quantity (EOQ). The types of data were primary and secondary data. The primary data were obtained from interviews and the secondary data were gathered from literature studies. ABC analysis shows that PT XYZ has 9 types of books classified as class A. Inventory control using the EOQ method results average order of 10 times and the order quantity per year is 126,022 copies. The EOQ method results in cost savings of IDR 165.186.141 or 59.16% of the company's total inventory costs
Keyword: ABC analysis, EOQ, inventory costs, optimal quantity

Judul: Pemurnian dan karakterisasi protein inhibitor RNA helikase virus hepatitis C
Abstrak: Hepatitis C virus (HCV) infection is the second most common chronic viral infection in the world with global prevalence. This infection is contribution to chronic hepatitis and liver cirrhosis, often leading to hepatocellular carcinoma. There is no effective drug and vaccine available against HCV. The current standard treatment, a combination of pegylated interferon-α with ribavirin, is limited by its suboptimal response rate in a significant patient population, side effects, and affordability. Therefore, development of effective drug is needed. One approach to find out the candidate of antiviral drug is to discover the inhibitor of enzyme that essential for virus replication, such as RNA helicase. Streptomyces chartreusis 5-095 produce the inhibitor of HCV RNA helicase. The aim of this study was to purify the protein inhibitor which has inhibition activity against ATPase activity of RNA helicase HCV from S. chartreusis 5-095. The supernatant of culture S. chartreusis 5-095 exhibited high inhibiton activity against ATPase activity of RNA helicase HCV (approximately 72%) at 10 days of incubation. The extracellular protein inhibitor was partially purified by procedures of precipitation with ammonium sulfate to 65% saturation and gel filtration (Sephadex G50) using methanol water solution (4:6) as an eluen. The purity of protein inhibitor was monitored by SDS PAGE. The protein inhibitor showed a relative molecular mass were estimated to be 14 kDa and increased the purity 23,08 fold than those of the crude protein. The specific activity and IC50 after purification were 13,1338 U/mg and 0,0767 mg/mL, respectively. The activity of purified protein inhibitor showed its stability over pH range from 5-8 and optimum at pH 7,4. The inhibition activity showed its stability up to 70% at temperature 100 oC. The purified protein inhibitor relatively stable its activity at storage in the range of -20 oC to room temperature for 35 days.
Keyword: