Judul: Web Log Mining Menggunakan k-Means pada Server Proxyuntuk Perancangan Manajemen Bandwidth IPB
Abstrak: IPB internet services isimproving every year, both from the infrastructure and service aspects. One of the infrastructure improvements is internet bandwidth enhancement. However, research on user characterization of internet usage in IPB has never been done. This study uses k-Means algorithm to cluster IPB proxy server log's file to obtain the characteristics of internet users. The research evaluates all user's log files including student, educational staff, and lecturer. This study resulted in 16clusters calculated based on the number of hits on the 14 site categories. Clustering resultsshowedthatthere weresimilaritiesin theuse of the internetfrom student dorm.In each cluster, thetotalaverage percentage of the sites with Service and Entertainmentcategoriesareabove 24% and 33%.Bandwidth management is designed based on member and utilization of each cluster.
Keyword: usage characterization, proxyserver, proxy log, k-Means, IPB’s internet, clustering

Judul: Analisis Penggunaan Layanan Jaringan Internet IPB
Abstrak: Bogor Agriculture University (IPB) has implemented internet network technology to support education. This study aims to determine patterns of IPB internet network service usage based on application protocols that are accessible through the network and the composition of websites that are frequently visited by IPB academic community. The data used in this study is IPB internet traffic, which were obtained through measurements using Wireshark. The first results show that the observed application protocol traffic has a proportion as follows: HTTP is 87.41%, SSL protocol is 11.27%, FTP protocol is 0.09%, FTP-data protocol is 0.66%, and SMTP merged with POP is 0,57%. HTTP is the most popular protocol used in IPB network. The other results of this study also show the composition of websites visited by IPB academic community. The portion for commercial website is 88.35%, where as the portion for the website that supports educational process is 8.15%. We also obtained information that IPB internet users access to pornography sites at 1.4%. Therefore efforts need to be made to increase the use of IPB internet network services for education.
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Judul: Karakteristik Piezoelektrik Film LaxSr₁-xTiO3 di atas Substrat TCO
Abstrak: Studi material perovskite SrTiO3 sudah banyak dilakukan dan menunjukkan sifat feroelektrik, piezoelektrik, kuantum paraelektrik dan superkonduktor yang baik. Dengan penambahan dopant La2O3 diduga menambah performa sifat piezo dan karakteristik lainnya. Karakteristik film LaxSr₁-xTiO3 (LST) dengan variasi x= 0, 0.02, 0.04, 0.06 terbentuk pada suhu annealing 550 oC di atas substrat TCO melalui metode (Chemical Solution Deposition) CSD dan spin coating dengan 700 rpm pada kondisi suhu ruang dan tekanan atmosfer standar. Hasil menunjukkan, semakin banyak pendadah La maka nilai ketebalan film, ukuran rerata kristalit, parameter kisi, transmitansi, nilai konduktivitas (maksimum 589.7 S/cm pada sampel x=0.04 di frekuensi 10 Hz), nilai konstanta tegangan (c) dan muatan (d) piezo semakin meningkat. Dinamika bentuk grafik nilai tegangan (V) dan konstanta regangan mekanik (s) nampak mirip. Nilai V mencapai 0.127 V untuk x=0.06 (beban 50 g). Nilai maksimum c, d, s masing-masing mencapai 20.07 Vm/N, 1.14x10-8 C/N, 13642.71. Nilai band gap untuk x=0, 0.02, 0.04, 0.06 masing-masing 3.21 eV, 3.1 eV, 2.6 eV, 2.4 eV. La2O3 menambah performa sifat piezo, sehingga LST berpotensi sebagai sensor tekanan.
Keyword: CSD method, La2O3, LaxSr1-xTiO3, piezoelectric, TCO