Judul: Pendugaan Parameter Waktu Perubahan Proses Pada x2 Control Chart Menggunakan Penduga Kemungkinan Maksimum
Abstrak: Statistical Procces Control (SPC) adalah salah satu cabang dari ilmu statistika yang mempelajari penerapan teknik statistika untuk mengukur dan menganalisis variasi yang terjadi selama proses produksi berlangsung. Control chart adalah alat yang digunakan untuk memantau berjalannya proses produksi sehingga bisa diketahui apakah proses produksi dalam kondisi terkontrol ataukah tidak. Bila control chart memberikan sinyal, berarti telah terjadi penyimpangan proses dari kondisi normalnya karena adanya penyebab variasi. Keberhasilan mengidentifikasi penyebab variasi memungkinkan seorang insinyur untuk memperbaiki kualitas produk dengan cara menghindari perubahan variasi yang menyebabkan menurunnya kualitas. . Tujuan dari tesis ini adalah melakukan kajian teoritis tentang penduga (yaitu penduga waktu perubahan proses) dan mengamati karakteristik penduga tersebut menggunakan simulasi dengan MATLAB 7.0.
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Judul: Pengendalian Produk Below Standard (BS) Wafer Stick di PT XYZ dengan Menggunakan Aplikasi Statistical Process Control.
Abstrak: PT XYZ merupakan sebuah perusahaan yang konsisten bergerak dalam bidang industri pangan. Produk pangan yang dihasilkan salah satunya adalah wafer stick. Kapasitas proses produksi wafer stick yang besar menghasilkan mutu produk di bawah standar (Below Standard, BS) yang relatif besar sehingga perlu dilakukan pengendalian mutu secara statistik. Metode statistik yang digunakan untuk mengendalikan produk BS wafer stick adalah Statistical Process Control (SPC). Hasil menunjukkan bahwa jenis BS yang dominan pada proses produksi wafer stick adalah BS stick dan BS sheet. Penerapan perbaikan dengan menggunakan alat bantu SPC dapat menurunkan persentase BS stick dan BS sheet. Persentase BS stick dan BS sheet pada awal proses satu Shift sebelum dan sesudah perbaikan yaitu 5.81 ± 2.10% menjadi 5.59 ± 3.70% BS sheet dan 4.51 ± 2.55% menjadi 3.50 ± 1.06% BS stick. Kondisi proses produksi hari Senin perubahan BS sheet dan BS stick yaitu 2.93 ± 2.25% menjadi 2.22 ± 0.42% BS stick dan 3.49 ± 2.47% menjadi 3.49 ± 1.18% BS sheet.
Keyword: grafik kendali, mutu, SPC, wafer stick

Judul: Merremia dennstedt ex endlicher (Convolvulaceae) in Sumatra.
Abstrak: Merremia is a small genus in the family Convolvulaceae. Merremia is a perennial or annual herb or woody liana with stems creeping or twinning on trees or rocks, put out milky white sap when injured and some species with tubers. Merremia is often confused with genus Ipomoea, due to they have resemblance in funnel shaped or campanulate corolla and straight anther. Phenetically, some members of Merremia have yellow flower whereas Ipomoea has white, purple or purplish white. Merremia is also confused with Operculina due both have non-spinulose pollen and dehiscent capsule. Nevertheless, Operculina characterized by circumciselli capsule and Merremia characterized by valve capsule. The important character in Merremia is the spread of the hairs on corolla that can be easily observed at the mature flower bud. The genus Merremia is found in the tropical regions of both hemispheres. Merremia wildly distributed throughout the tropical regions of Asia, Africa, Australia, North and South America and approximately there were 80 species of Merremia in the world. A Total of 175 sheets (164 collection numbers) which are deposited in Herbarium Bogoriense, 97 sheets (95 collection numbers) which are deposited Andalas University Herbarium (ANDA) and 9 sheets (4 collection numbers) which are deposited in BIOTROP Herbarium (BIOT) were studied. It composed of all specimens of Merremia in Sumatra. Additional specimens were collected by the author 28 sheets (15 collection numbers) from North Sumatra, West Sumatra and Lampung, which are stored in BO and BIOT. The digital data that consist of type specimens and distributions of species from JSTOR Plant Science and Convolvulaceae Unlimited were also used here. All the hebarium specimens were studied based on their morphological characters following de Vogel (1987) and Rifai (1976). The terminology of morphological characters followed Lawrence (1955), Veldkamp (1987), Harris and Harris (1994), Hickey and King (2005) and Stearn (1983). Information on the habitat, ecology, distribution, vernacular names and uses were noted from the specimens label and literatures. Taxonomic studies in Sumatra were conducted. There are eight species, one subspecies, one varietas and two forma from nine previously species (M. cissoides, M. dissecta, M. emarginata, M. hirta, M. peltata, M. quinquefolia, M. tridentata, M. tuberosa and M. vitifolia), two subspecies (M. umbellata ssp. orientalis and M. tridentata ssp. hastata), one varietas (M. boisiana var. sumatrana) and two forma (M. hederacea f. pubescens and M. hederacea f. barbata) can be recognized. One species (M. tridentata) and subspecies (M. tridentata ssp. hastata) are excluded because they have been proposed to different new taxa Xenostegia by Austin and Staples. The existence of M. emarginata was noted as new record in Sumatra and M. cissoides was noted as new record in Indonesia. A phylogenetic analysis using PAUP*4.Ob10 was undertaken based on morphological characters, using Evolvulus nummularius and Porana volubis as the out group. The phylogenetic analysis used 35 morphological characters was resulted consistency index (CI) = 0.60, homoplasy index (HI) = 0.40, retention index (RI) = 0.56 and Rescaled consistency index (RC) = 0.34. Phylogenetic tree used morphological characters divided taxa into two groups. The separation support M. boisiana var. sumatrana, M. cissoides, M.
Keyword: Convolvulaceae, Merremia, morphology, phylogenetic, Sumatra