Judul: Peranan statistika dalam penerapan six sigma
Abstrak: Six Sigma adalah suatu metodologi yang bertujuan untuk meningkatkan performance dan mereduksi keragaman performance sehingga dapat mencapai kepuasan konsumen. Dalam penerapan Six Sigma setiap proses dalam produksi akan diamati, bukan hanya hasil akhirnya, namun Six Sigma juga memperhitungkan biaya yang dikeluarkan. Statistika mempunyai peranan penting dalam penerapan Six Sigma. Peran statistika mulai dari tahap identifikasi sampai dengan tahap kontrol. Namun saat ini penerapan statistika dalam Six Sigma masih kecil. Untuk itu dilakukan kajian pustaka tentang peranana statistika dalam penerapan Six Sigma.
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Judul: Aplikasi Six Sigma dalam Sistem Pengendalian Mutu di PT XYZ.
Abstrak: Industri kosmetik di Indonesia terus berkembang dengan persaingan antar perusahaan yang semakin ketat. Hal ini menyebabkan produsen dituntut untuk menghasilkan produk yang aman dan bermutu. Kosmetik adalah bahan atau sediaan yang yang digunakan pada bagian luar tubuh manusia dengan maksud membersihkan, memelihara, menambah daya tarik atau merubah rupa dan tidak termasuk golongan obat contohnya seperti sabun cuci muka. Meskipun produk sabun cuci muka cair telah melewati tahapan proses yang terjamin, namun pada kenyataannya masih terdapat produk substandard (dibawah standar). Hal ini dapat disebabkan oleh penyimpangan pada kinerja mesin, bahan baku, metode, serta tenaga kerja. Tujuan penelitian di PT XYZ adalah mengukur tingkat sigma dan memberikan saran perbaikan untuk menurunkan jumlah produk cacat sehingga dapat meningkatkan nilai sigma perusahaan (mendekati nilai sigma 6). Penerapan six sigma diharapkan dapat meningkatkan kualitas produk tersebut menuju target 3.4 kegagalan per sejuta produksi produk (99.9997% dari apa yang diharapkan pelanggan terhadap produk). Metode six sigma memiliki lima langkah proses, yaitu DMAIC (Define, Measure, Analyze, Improve, Control). Berdasarkan perhitungan tingkat sigma, PT XYZ berada pada tingkat 4 dengan rata-rata 4.43 pada Februari-April 2019. Berdasarkan hasil analisis dan diskusi bersama pakar mengenai faktor penyebab kerusakan diperoleh beberapa usulan diantaranya adalah rekreasi, rotasi kerja, penambahan alat pendingin, pelatihan, perbaikan dan modifikasi pada beberapa spare part mesin, pengadaan pelatihan autonomous maintenance, pengadaan preventive maintenance dan predictive maintenance, standarisasi ulang instruksi kerja, dan melakukan penambahan anggota QC.
Keyword: DMAIC, Kosmetik, Mutu, Six sigma

Judul: Characteristic of Overshooting Top (OT) Based on  Himawari  8  Satellite  as  a  Convective  Cloud  Feature  that  Generates  Extreme Weather in the Java Island Region
Abstrak: Overshooting Top (OT) is a feature at the top of a convective cloud that is associated with extreme weather. Research on OT in tropical Indonesia is still very limited. The existence of geostationary satellites with wide area coverage and fast frequency observations is useful for observing the fast dynamics of the OT life cycle. Therefore, this study intends to analyze the relationship between OT and extreme weather, updraft and thermodynamic conditions of OT when extreme weather occurs, the best objective method for detecting OT in the day time and night time, and the spatiotemporal distribution of OT in the tropical region of Java Island during the 2018-2021 period. Based on visual analysis using visible channel and Himawari 8 sandwich products, 87% of extreme weather events in Java were accompanied by the appearance of OT. It indicates that the presence of the OT pattern is a convection cloud pattern or feature that is closely related to extreme weather events for the Java Island region. The existence of a time lag between the appearance of OT and extreme weather events on Java Island indicates that the OT of convection cloud can be used as a precursor or nowcasting for the appearance of extreme weather. Most of the convective cloud OT features during extreme weather events on Java Island have altitude that were only able to exceed the altitude of the equilibrium level and few were able to exceed the tropopause level of 9 km – 16 km. The difference in atmospheric conditions during extreme weather events on Java Island, which is in the tropics and subtropics, is a strong and unstable convective energy condition characterized by a larger CAPE, as well as unstable KI, LI, SI and TTI values. It is offset by kinematic factors in the form of a weak vertical wind shear (bulk wind shear 0-6 km) and a higher freezing point height. The difference between extreme weather events in the Java Island region and other tropical regions compared to subtropical regions is the strong updraft speed of convection clouds. The IRW Texture COMB algorithm based on the IRW-Texture Gradient modification and the COMB algorithm shows a significant increase in quality for detecting OT and non-OT pixels in Java. Rainy days with rainfall > 50 mm/day are very common in areas with an altitude of > 500 m. On the other hand, the level of convection activity which is indicated by the presence of OT and lightning is significantly reduced in this area. OT of convective clouds appear more frequently during the DJF season and less frequently during the JJA season. OT often appears during the day time and rarely at night time. Most OTs appear in the central part, away from the south and north coasts of Java Island during the day, while OTs that appear near the south and north coasts of Java Island can appear in the morning or afternoon.
Keyword: convective clouds, extreme weather, Overshooting Tops, Himawari 8 Satellite