Judul: Market Analysis and Determination of the Cost of  Production for Mosquito Repellent Body Spray PT Eteris Prima Wiyasa
Abstrak: Peningkatan kasus demam berdarah dan penggunaan produk anti nyamuk yang mengandung DEET di pasaran mendorong PT Eteris Prima Wiyasa mengembangkan produk body spray anti nyamuk alami berbahan dasar minyak atsiri. Penelitian ini bertujuan mengetahui preferensi konsumen terhadap produk body spray anti nyamuk, merumuskan strategi bisnis dengan SWOT dan QSPM serta menentukan harga pokok produksi body spray. Tahapan penelitian terdiri dari fase eksplorasi, pendefinisian masalah, ideasi, pengembangan prototipe dan validasi. Berdasarkan hasil penelitian, terdapat tiga atribut produk yang dianggap sangat penting oleh konsumen dalam perancangan produk body spray anti nyamuk berupa efektivitas mengusir nyamuk, aroma dan harga. Strategi bisnis yang tepat untuk produk body spray anti nyamuk ini yaitu mempererat hubungan baik dengan pelanggan. Selain itu, didapatkan harga pokok produksi sebesar Rp 14.976/kemasan 100 ml dan harga jual produk sebesar Rp 34.500 dengan mark up 118% dan PPN 11%., The increasing cases of dengue fever and use of mosquito repellent products containing DEET on the market have prompted Eteris Prima Wiyasa company to develop a natural mosquito repellent body spray using essential oils. The research aims to determine consumer preferences for mosquito repellent body spray products, formulate business strategies using SWOT and QSPM, and determine the production cost of the body spray. The research stages include of exploration, problem definition, ideation, prototype development and validation. Based on the research results, there are three product attributes that are considered very important by consumers in the design of mosquito repellent body spray products, namely mosquito repelling effectiveness, aroma, and price. The right business strategy for this mosquito repellent body spray product is to strengthen customer relationships. In addition, the production cost is obtained at Rp 14.976/100 ml pack and the selling price of the product is Rp 34.500 with a markup of 118% and VAT of 11%.
Keyword: Business strategy, Production Cost, mosquito repellent body spray

Judul: Synthesis of para-Menthane-3,8-diol  from Citronellal Fraction of Citronella Oil as Mosquito Repellent
Abstrak: The significant prevalence and mortality rate of dengue cases worldwide highlight the importance of promoting treatment and prevention measures, such as the utilization of mosquito repellents, but it is known that the active compounds commonly found in mosquito repellent can cause some side effects. A viable alternative compound for an effective mosquito repellent with less side effects is para-Menthane-3,8-diol (PMD). The production of PMD can be done by synthesizing the citronellal fraction of citronella oil using sulfuric acid as the catalyst through a cyclization of citronellal to PMD, but a by-product called PMD citronellal acetal will be formed if the reaction continues to proceed. This research was conducted in two phases. The first phase focused on the synthetization of PMD, then the formulation of PMD-based mosquito repellent spray. The first phase conducted The experimental design using a 23 Factorial Design with 3 factors, namely temperature, acid concentration, and synthesis duration, and 5 additional midpoint experiments. The observed parameters were PMD content, PMD citronellal acetal content, percentage of converted citronellal, and percentage of citronellal and isopulegol converted into PMD. The second phase was conducted using a Completely Randomized Design to investigate the effect of varied addition of PMD. The product was then characterized and evaluated through hedonic test. PMD synthesized at 50˚C and sulfuric acid concentration of 0,25% for 8 hours produced a product with PMD concentration of 77,32%, 12,61% PMD citronellal acetal, converted citronellal at 96,601%, and percentage of citronellal and isopulegol converted to PMD is 95,966%. While from the verification phase done at 50˚C and sulfuric acid concentration of 0,25% for 5 hours produced a product with PMD concentration of 55,37%, 14,44% PMD citronellal acetal, converted citronellal at 85,92%, and percentage of citronellal and isopulegol converted to PMD is 74,1%. Panelist particularly favored the mosquito repellent spray containing 8 ml or 8% PMD that had density of 1,0035 g/cm3, pH of 9,44, have strong aroma dominated by citronella with hints of herbaceous and warm notes, an opaque white liquid with watery consistency and slippery when applied but tended to get slightly sticky after a while.
Keyword: Fraksi sitronelal, minyak serai wangi, para-Menthane-3,8-diol, repelan  nyamuk

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf