Judul: Analisis Peramalan Permintaan dan Perencanaan Agregat  Pada UMKM Risollaku Bogor
Abstrak: Risollaku merupakan salah satu UMKM di wilayah Bogor Barat yang memproduksi kue risoles yang dijadikan makanan olahan beku. Dalam menjalankan usahanya, Risollaku memiliki kendala dalam memperkirakan jumlah permintaan dan produksi. Tujuan dari penelitian ini yaitu untuk mengatasi permasalahan permintaan pada UMKM Risollaku. Penelitian ini menggunakan data permintaan dari bulan Juli 2019-Oktober 2020 yaitu pada masa sebelum pandemi hingga saat pandemic berlangsung. Berdasarkan hasil analisis, kedua kondisi tersebut memiliki hasil yang sama dalam perbandingan tingkat penjualan. Hasil penelitian menujukkan bahwa metode yang paling tepat digunakan untuk meramalkan permintaan adalah metode trend analysis karena memiliki tingkat kesalahan yang paling kecil yaitu sebesar 16% untuk masa sebelum pandemi dan 21% untuk masa setelah adanya pandemi. Perencanaan agregat dilakukan dengan menggunakan data ramalan permintaan saat pandemi dan diperoleh hasil bahwa strategi perencanaan agregat yang paling tepat adalah strategi pengendalian jumlah persediaan. Strategi ini menghasilkan biaya yang paling rendah yaitu sebesar Rp102.172.774 untuk periode 12 bulan ke depan. Kata kunci: Peramalan, permintaan, time series, perencanaan agregat, Risollaku
Keyword: Forecasting, demand, time series, aggregate planning, Risollaku

Judul: . Optimization of Demand Forecasting and
Aggregate Planning of Eco Bakery Tangerang Regency
Abstrak: Toko Roti Eco sebagai salah satu toko roti di Kabupaten Tangerang menghadapi kendala dalam merencanakan dan mengendalikan produksinya. Keadaan yang sering terjadi ialah produksi yang melebihi permintaan sehingga banyak roti yang tidak terjual dan menyebabkan inefisiensi pendapatan. Oleh karena itu, tujuan dari penelitian ini adalah meramalkan permintaan dari empat jenis roti di Toko Roti Eco, yaitu roti tawar original, roti tawar pandan, roti manis, dan roti unyil dan menentukan strategi perencanaan agregatnya. Penelitian dilakukan di Toko Roti Eco yang berlokasi di Kabupaten Tangerang sejak bulan Januari sampai April 2024. Metode peramalan permintaan yang digunakan meliputi weighted moving average, exponential smoothing with trend adjustment, dan trend analysis. Sedangkan opsi strategi perencanaan agregat menggunakan level strategy, chase strategy, dan mixed strategy. Hasil peramalan menunjukkan bahwa metode trend analysis merupakan metode terbaik karena memberikan tingkat kesalahan peramalan yang terkecil. Hasil perencanaan agregat menunjukkan bahwa mixed strategy merupakan strategi yang terbaik karena menghasilkan biaya yang terkecil., Eco Bakery as one of the bakeries in Tangerang Regency faces obstacles in planning and controlling its production. A situation that often occurs is that production exceeds demand, resulting in a lot of bread not being sold and causing income inefficiencies. Therefore, the goals of this research was to predict the demand for four types of bread at the Eco Bakery, namely original white bread, pandan white bread, sweet bread, and small bread, and to determine the aggregate planning strategy. The research was conducted at the Eco Bakery Shop located in Tangerang Regency from January to April 2024. The demand forecasting methods used included the weighted moving average, exponential smoothing with trend adjustment, and trend analysis. Meanwhile, the aggregate planning strategy options used were the level strategy, pursuit strategy, and mixed strategy. The forecasting results showed that the trend analysis method was the best method because it provided the smallest level of forecasting error. The aggregate planning results showed that the mixed strategy was the best strategy because it produced the smallest costs.
Keyword: peramalan, analisis tren, strategi campuran, strategi chase, strategi level

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell