Judul: Analisis biplot PDRB provinsi-provinsi di Indonesia tahun 2007
Abstrak: Analisis biplot merupakan suatu upaya untuk memberikan peragaan secara grafis dari matriks data X dalam suatu plot dengan menumpangtindihkan vektor-vektor baris matriks X (objek) dengan vektor-vektor yang mewakili kolom matriks X (peubah). Melalui visualisasi biplot diharapkan diperoleh gambaran tentang objek, misalnya kedekatan antar objek, dan gambaran tentang peubah, baik tentang keragaman maupun korelasinya. Penelitian ini menggunakan data PDRB provinsi tahun 2007 dan bertujuan untuk membandingkan provinsi-provinsi di Indonesia melalui nilai PDRB-nya; eksplorasi objek yang dominan pada visualisasi biplot; dan meninjau panjang vektor dan sudut vektor peubah pada biplot dalam menjelaskan keragaman dan hubungan antar peubah. Hasil analisis biplot bagi 33 provinsi terhadap PDRB-nya memperlihatkan bahwa sebagian besar provinsi-provinsi di Pulau Jawa merupakan provinsi yang menghasilkan PDRB di atas ratarata di berbagai sektor, kecuali di sektor pertambangan dan penggalian. Secara deskriptif, persentase sebagian besar PDRB provinsi-provinsi di Indonesia masih didominasi oleh sektor pertanian. Objek-objek yang memiliki nilai di atas rata-rata dapat mempengaruhi konfigurasi visualisasi biplot dan ditampilkan karakteristiknya sacara lebih dominan sehingga objek yang memiliki nilai yang berada di bawah rata-rata karakteristiknya kurang tereksplorasi. Evaluasi panjang vektor dan nilai kosinus sudut antar vektor peubah pada visualisasi biplot dapat ditunjukkan bahwa panjang vektor peubah dan nilai kosinus sudut antar vektor peubah berkorelasi signifikan terhadap keragaman dan korelasi antar peubah dengan nilai masing-masing sebesar 0,926 dan 0,873.
Keyword: Biplot, PDRB, Deskriptif, Korelasi, Keragaman, Bogor Agricultural University

Judul: Pemetaan Provinsi di Indonesia Berdasarkan Produk Domestik Regional Bruto Menggunakan Analisis Biplot
Abstrak: Government has a responsibility for maintaining welfare development of its people. One of the indicators that can be used to measure human development is the human development index (HDI). This index was created based on three dimensions, i.e. dimension of life expectancy, knowledge and standard of decent living. This paper provides an overview of mapping the provinces based on independent sectors of business field. The provincial mapping is done using biplot analysis. Biplot analysis presents a low-dimensional graphical display, which describes relationship between high-dimensional variables and objects. Provincial mapping can be used to obtain an overview of development between provinces. The result of biplot analysis is able to explain 85.22% information contained in the data, which is called its goodness of fit. Based on the biplot visualization, five groups of provinces are obtained. In the first group, Jakarta has a value above average on the financial sector. On the second and third groups, the agricultural sector contributes significantly to gross regional domestic product. Meanwhile, in the fourth group, Riau and East Kalimantan are the biggest contributor to the trade sector. Finally, in the fifth group, all of the provinces have gross regional domestic product value below the average in all sectors.
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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