Judul: Study of simplicial complex and kth Betti number on coverage of indoor GSM signal booster network.
Abstrak: Sinyal perangkat mobile sering kali menghilang saat memasuki gedung beratap. Masalah tersebut dapat diatasi dengan menambahkan penguat sinyal di dalam gedung beratap. Tujuan penelitian ini ialah mengonstruksi cakupan jaringan penguat sinyal dalam suatu ruangan dengan konsep simplicial complex dan kth Betti number. Simplicial complex adalah objek amatan yang berada pada ruang topologi dan kth Betti number merupakan ciri atau karakteristik dari objek amatan yang berada pada ruang topologi. Dengan software Matlab R2008b yang terintegrasi JPlex dan Wolfram Mathematica7, cakupan jaringan penguat sinyal dalam suatu ruangan dapat dikonstruksi. Langkah-langkah yang dilakukan ialah: memasukkan koordinat titik, memberikan diameter cakupan jaringan penguat sinyal, dan menganalis koordinat titik dengan konsep simplicial complex dan kth Betti number. kth Betti number dari suatu simplicial complex dilambangkan dengan βk . Nilai β0 adalah jumlah unit yang terhubung dari suatu simplicial complex dan nilai β1 adalah jumlah lingkaran lubang dari suatu simplicial complex., The mobile devices signal often disappear when entering the building. The problem could be solved by equipping the building with a signal amplifier. The purpose of this study is to construct a network coverage signal booster in a room with the concept of simplicial complex and kth Betti number. Simplicial complex is observed objects in the topological space and the kth Betti number is a trait or characteristic of the observed objects in the topological space. Using integrated Matlab R2008 with JPlex and Wolfram Mathematica7, the network coverage in an indoor signal booster can be constructed. The performed steps are: enter the coordinates of points, give the diameter of network coverage signal amplifier, and analyze coordinates of points the concept of simplicial complex and kth Betti number. kth Betti number of a simplicial complex is denoted by βk. β0 denotes the number of connected units of a simplicial complex and β1 denotes the number of circular holes of a simplicial complex. Keywords: kth Betti number, simplicial complex, topology
Keyword: kth Betti number, simplicial complex, topologi

Judul: Regresi Terboboti Geografis dengan Fungsi Pembobot Kernel Gaussian pada Kekuatan Sinyal Seluler
Abstrak: Kekuatan sinyal jaringan seluler dapat dipengaruhi oleh lokasi sehingga penelitian yang berkaitan dengan kekuatan sinyal membutuhkan informasi berupa lokasi pengamatan dan teknik analisis yang memperhatikan aspek spasial. Analisis regresi spasial memperhitungkan faktor lokasi dalam memodelkan hubungan antara peubah penjelas dengan peubah respon. Salah satu metode analisis regresi spasial adalah Regresi Terboboti Geografis (RTG). Metode ini memanfaatkan faktor lokasi sebagai matriks pembobot yang dibentuk menggunakan fungsi pembobot. Analisis RTG dengan fungsi pembobot kernel Gaussian menghasilkan model yang lebih baik dari model regresi Metode Kuadrat Terkecil. Model yang dihasilkan RTG berupa model lokal dengan penduga parameter yang berbeda-beda pada setiap titik amatan. Penggerombolan titik amatan dilakukan untuk meringkas hasil RTG. Jumlah gerombol optimal pada penggerombolan berdasarkan koefisien penduga parameter adalah lima gerombol sedangkan pada penggerombolan berdasarkan nilai-p hasil uji-t sebanyak empat gerombol.
Keyword: analisis gerombol, kernel gaussian, regresi terboboti geografis

Judul: Amfibi sebagai satwa peliharaan: Ekspor, Impor dan Perdagangan Domestik
Abstrak: Indonesia has exported amphibian as frozen frog legs (listed since 1969 under fishery product) for consumption and live amphibian (listed since 1983 under reptilian class in forestry product) for pets. There are also live amphibian trading in local level i.e in markets and malls. This research aims to identify amphibian species exported and imported by investigating document from related administration and to identify amphibian species traded in domestic market by observation at Jakarta. Research is primarily conducted by processing quota data taken from Department of Forestry Republic of Indonesia database in Jakarta. Market observation was carried out in 18 locations (3 markets and 15 malls) in Jakarta. I carried out interview with trader and export business, which related to net trading live amphibians for pets. Respondent was choosen using snowball sampling manner. Name of species is written according to Iskandar & Coljin (2000). If there is no such record in the checklist (for example species are from outside Indonesia), then the species name is written according to Frost (2004). There are 56 species from eight families of wild amphibians that have pets quota between 1998-2008. Nineteen species was traded since 1983. The highest export quota is Litoria caerulea (21,37%). Allocation of highest catching quota is for BKSDA Jayapura (20,40%) and BKSDA Papua Barat (18,96%). Four species are included in IUCN Red List categories as vulnerable, among others are Limnonectes macrodon, Meristogenys jerboa, Nyctixalus margaritifer and Rhacophorus margaritifer. The number of amphibians that have export realization are 39 species. Two species of amphibian, Leptobrachium hasseltii and Rhacophorus margaritifer are amphibian species whose been known infected by chytrid fungus in the wild. The biggest species exported is Litoria caerulea (54,34%). Between 1983-1991, the biggest import amphibian for pets from Indonesia (66,13%) is Netherlands. Number of quota was relative stable in the last eight years, where as the number of export realization is more fluctuates. Amphibian species imported and re-exported between 1983-2008 come from Africa, South Asia, Malaysian, Archipelago Oceania, North America, Central America and South America. The number of pet amphibian species traded at domestic market is less than exported. Data showed that Indonesia imports 15 amphibian species between 1983-2008, However I found different species in the market that was unrecorded in the Ministry of Forestry data, which is the Fire Belly Salamander.
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