Judul: Prediksi Perpindahan Penggunaan Merek Simcard dengan Pendekatan Rantai Markov
Abstrak: Offering cheaper starter pack of simcard and cheaper tariff in GSM prepaid card constitute some strategies of telecommunication provider in costumer’s designation. However, there is a significant consequence caused by these strategies, i.e. costumers prefer to use cheaper GSM cards regardless to other factors. This condition will make customers easy to switch between GSM cards. This switching problem should be taken into consideration, if the telecommunication companies do not want to loose their costumers due to more expensive rates compared to other telecommunication companies. The aims of this research are to describe the brand switching of simcards by using Markov chain model and to analyze the characteristic of consumers of prepaid GSM cards. Cellular card that controls market can be determined from the most mobile card, which has the greatest probability of use. Meanwhile, from the transition probability point of view, cellular card that controls market is the card that has the greatest transition probability to itself rather than to the others.
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Judul: Analisis Daya Tahan Pengguna Nomor Kartu Prabayar Telekomunikasi
Abstrak: Telecomunication prepaid customer has increased significanly compared to postpaid customers. The growth in prepaid is driven by a end-to-end simple ecosystem that is built by telecommunication operator, for example started pack can be bought anywhere anytime, retail outlet for voucher can be found everywhere. That simplicity has been creating another effect to customer in which they can easily switch sim card after the balance run out.That behavior driven by regulation in buying prepaid SIM that not optimum in which customer data can not be validated. The impact of rotational prepaid customer gives a high cost to telecommunication provider and the availability of number becomes limited. For customers, the impact of rotational SIM has made them vulnerable from spamming. Those impact can be minimized if regulator and telecommunication operator knows the factors that drives customer changing their SIM cards.This study is to define the factors which has driven customers in buying new SIM cards, by survival model of prepaid customers and to define the probability loyal customer based on significant characteristics. Data in this study is based on survey to 300 prepaid customers in DKI Jakarta. Survival Analysis is a statistical technique to define the pattern of survivals based on failure times and survival times. Data of survival times is measured from the time customer bought the SIM card until event in which customer stop using it. In his study, characteristic that are both significantly effect to drives rotational customer is age, voucher price and income. Based on the value of its hazard ratio, age 16 until 18 years, income 1.5 until 3 million voucher price under 10 thousand rupies category is an indicator that gives customer the greatest influence in determining the level of one’s impact of rotational prepaid customer.
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Judul: Jenis, distribusi dan kualitas habitat ular air tawar di perairan danau matano dan danau towuti, Sulawesi Selatan
Abstrak: Berdasarkan data di Wetlands Data Base PHPA/Wetlands Internasional, lebih dari 179 spesies fauna yang dilindungi, kehidupannya bergantung pada lahan basah. Indonesia memiliki ekosistem lahan basah (wetlands) terluas di Asia, dengan luas kurang lebih 38 juta ha atau sekitar 21% dari luas daratan, sehingga Indonesia termasuk kawasan terkaya dalam hal keanekaragaman hayatinya. Akan tetapi betapun pentingnya ekosistem ini bagi kehidupan baik daur zat haranya, daya dukung dan keterbatasan ekologinya akan tetapi semua itu belum banyak diketahui Ekosistem lahan basah di Sulawesi merupakan unsur yang esensial bagi kehidupan sebagai habitat berbagai spesies flora dan fauna yang bernilai ekonomis, habitat bagi berbagai spesies endemik atau yang keberadaannya terancam punah. Danau Towuti dan Danau Matano memiliki potensi satwa perairan yang tinggi, baik keanekaragaman maupun kelimpahan spesiesnya termasuk jenis-jenis herpetologi. Meski demikian, sangat disayangkan bahwa selama ini penelitian yang dilakukan terhadap kajian herpetologi masih sangat sedikit. Ular air ternyata memegang peranan penting di ekosistem perairan Indonesia Ada juga beberapa spesies ular air yang keberadaanya mengganggu nelayan dan areal budidaya ikan/belut. Meski demikian pentingnya peranan ular air, akan tetapi pengetahuan tentang biologi dan taksonominya masih sangat terbatas sehingga membutuhkan kajian lebih lanjut. Penelitian ini bertujuan untuk mengetahui jenis ular air tawar yang ada & distribusinya di bagian perairan kedua danau, mengetahui kondisi dan karakter fisik tepi/pantai danau yang digunakan sebagai habitat ular air tersebut, mengetahui kualitas perairan Danau Towuti dan Danau Matano Sulawesi Selatan dalam mendukung kehidupan organisme perairan. Dengan adanya penelitian ini diharapkan diperoleh informasi tentang jenis-jenis ular air tawar dan distribusinya, tipe pantai / tepi dan kualitas perairan danau sebagai habitat khususnya di perairan Danau Matano dan Danau Towuti. Penelitian dilakukan di Danau Towuti dan Danau Matano, Kabupaten Luwu Utara, Sulawesi Selatan. Pengambilan data lapangan pada bulan September 2002, Februari dan April 2003. ...
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