Judul: Penerapan Metode CHAID Dalam Analisis Segmentasi Pasar Pengguna Handphone.
Abstrak: Segmentasi pasar bertujuan untuk mengelompokkan konsumen yang memiliki karakteristik yang homogen. Adanya segmentasi pasar akan memudahkan produsen dalam membuat strategi pemasaran kepada segmen yang dituju. Salah satu metode yang digunakan untuk melakukan segmentasi pasar adalah metode CHAID (Chi-square Automatic Interaction Detection). Metode CHAID dapat digunakan untuk mencari peubah-peubah penjelas yang paling berpengaruh terhadap peubah respon. Hasil analisis dari penelitian ini adalah terdapat tiga peubah penjelas yang berpengaruh terhadap merek handphone yang digunakan oleh konsumen, diantaranya usia, wilayah tempat tinggal, dan pendidikan terakhir. Peubah penjelas yang paling berpengaruh terhadap peubah respon adalah usia. Analisis CHAID menghasilkan sebelas segmen dimana segmen terbesar adalah Samsung. Handphone Samsung paling banyak digunakan oleh konsumen pada segmen 1, 2, 4, 5, 6, 7, 9, dan 10. Sedangkan handphone Nokia adalah segmen terbesar kedua. Nokia banyak digunakan oleh konsumen pada segmen 3, 4, 8, 9, dan 11. Sementara itu, persentase pengguna Blackberry sangat sedikit pada setiap segmen
Keyword: merek handphone, metode CHAID, segmentasi pasar

Judul: Metode CHAID dan Korespondensi untuk Segmentasi Pasar dan Pemetaan Brand Image pada Beberapa Merek Kartu GSM.
Abstrak: One of the comunication tools that are nesisity and supports our needs in this era is mobile phone or often called HP (Hand Phone). Therefore it increases the buiness competition between provider companies in Indonesia. Hence, producers will increase their efforts to conduct evaluation and innovation on their products. These efforts, include maintaning and/or increasing market segmentation and making good impression about their product to consumers. One of the analysis that can be used for evaluating market segmentation and measuring brand image measuring are CHAID and correspondence. CHAID show that there were two segments which are 15-25 years old and 26-35 years old. The consumers have an impressions which support CHAID results. The results indicate that IM3 has a ‘cheap conversation tariff’ impression, 3 (TRI) has a ‘for school childern’impression, XL has a ‘fast internet access’ impression, AXIS has a ‘inexpensive short message service’ impression, Simpati has a ‘for executive/proffesional’ impression, and AS has a ‘the modern simcard’ impression. In general, it can be said that people who are 15-25 years old prefer using XL, AXIS, and 3 (TRI) as their provider, meanwhile people who are 26-35 years old like using Simpati.
Keyword: Segmentation, Brand, Correspondence, CHAID

Judul: Heterologous Expression Of Endo-Β-Xylanase From Bacillus Pumilus Strain Bcrs-01 In Escherichia Coli.
Abstrak: Xylanases are glycoside hydrolase family 11 which depolymerise xylan in the plant cell wall, the most excessive form of hemicellulose. Endo-β-xylanases (EC 3.2.1.8) are most important to breakdown β-1,4-glicoside bond of xylan to produce disaccaride xyloolygosaccaride (XOs) and xylose (monomer). Bovine rumen fluids have potential to obtain endo-β-xylanase produced of bacteria. The objectives of this study were to obtain xylanase producing bacteria and to express xynA gene encoding endo-β-xylanase from bacterium in Escherichia coli. Twenty nine isolate bacteria have been succesfully isolated from bovine rumen fluid in agar medium containing birchwood xylan. Isolate BCRS-01 bacterium was previously screened for the high production of xylanase. Based on 16S rRNA gene sequence analysis, BCRS-01 showed high similarity (99%) to Bacillus pumilus (accession number NR043241). The crude xylanase had optimal activity at 55oC, pH 7.0. Furthermore, the crude xylanase exhibited broad pH stability from 4.0 to 10.0 and remained more than 60% and 40% of its activity after incubation at pH 4.0 until 10.0, respectively for 60 min. It also showed a stability at temperature 25-50oC since it retained 80% and 50% of its activity when incubated at 50oC or 30 and 60 min, respectively. The xylanase activity was strongly inhibited by Ca2+ and Cu2+ at concentration 10 mM, and as little as 1 mM for Mn2+. Therefore, this xylanase has potentially used as additive feeds in animal feed industry. The DNA sequence xynA gene encoded endo-β-xylanase was amplified and cloned into the expression vector pET-15by under the control of T7 promoter. The recombinant protein had succesfully expressed in Escherichia coli BL21 (DE3) pLysS. A protein recombinant of approximately, 26.7 kDa was observed on the SDS-PAGE analysis. Crude extract of recombinant endo-β-xylanase demonstrated activity of enzyme at 56 U mL-1 using birchwood xylan as a substrate at 55oC for 10 min.
Keyword: Bacillus pumilus, bovine rumen fluid, endo-β-xylanase, heterologous expression.