Judul: Komunitas burung di bawah tajuk pada hutan primer dan hutan sekunder di Taman Nasional Bukit Barisan Selatan:
Abstrak: Komposisi penyusun suatu komunitas burung sangat dipengaruhi oleh faktor spasial berupa tingkat suksesi, efek tepi dan kompleksitas vegetasi serta faktor temporal seperti kelimpahan pakan. Perubahan tingkat suksesi hutan merupakan faktor penting yang mempengaruhi komposisi komunitas burung di alam. Secara teoritis hutan sekunder dipandang kurang memiliki nilai konservasi. Walaupun demikian beberapa penelitian menunjukkan bahwa hutan sekunder juga memiliki keanekaragaman spesies burung yang tinggi. Hutan sekunder juga dipandang sebagai habitat alternatif selain hutan primer untuk konservasi keanekaragaman hayati di kawasan tropis. Penelitian ini dilakukan untuk membandingkan keanekaragaman spesies burung di bawah tajuk pada tipe hutan primer dan sekunder dan faktor-faktor yang mempengaruhinya. Pengumpulan data dilakukan pada bulan Maret – Juni 2009 di Tambling Wildlife Conservation Nature Conservation yang terletak pada zona pemanfaatan Taman Nasional Bukit Barisan Selatan, Lampung. Penelitian dilakukan dengan menggunakan jaring kabut yang dioperasikan antara pukul 06.00-18.00 WIB selama 2-3 hari untuk memperoleh total waktu pengoperasian 24 jam di setiap anak plot. Jumlah total waktu pengoperasian jaring kabut yang dihasilkan ialah 2304 meter jam jaring kabut. Selain itu dilakukan pengumpulan data jumlah artropoda dan kondisi vegetasi untuk mengetahui pengaruh faktorfaktor tersebut terhadap keanekaragaman dan kekayaan spesies.
Keyword: komunitas burung, efek tepi, kompleksitas vegetasi, faktor temporal, kelimpahan pakan, hutan sekunder, keanekaragaman hayati, Tambling Wildlife Conservation Nature Conservation, Taman Nasional Bukit Barisan, Lampung

Judul: Keanekaragaman jenis burung pada beberapa tipe habitat di Tambling Wildlife Nature Conservation (TWNC), Taman Nasional Bukit Barisan Selatan Lampung
Abstrak: Tambling Wildlife Nature Conservation (TWNC) is part of the Bukit Barisan Selatan National Park. The area called Tambling (Tampang-Belimbing) is a conservation area that conserve high biodiversity. TWNC is managed by PT Adhiniaga Kreasinusa (AKN). The purposes of this research are 1). to compare the diversity of bird species at several types of habitat in TWNC, those are coastal forest, lowland forest, plantation and grassland. 2). to identify the difference of bird species composition among types of habitat. 3). to know the local birds distribution related to the types of habitat in TWNC. This research was conducted from August to November 2009. Data of birds was collected using MacKinnon species list and point count method or IPA (Ponctuel Indices d'Abondance). Data of habitat was collected using vegetation analysis and habitat used approach. Data of vegetation was collected by sampling plot 20 x 100 m. T-test was used to determine differences in bird species diversity among the coastal forest, lowland forest, plantation, and grassland habitats at the 95% confidence level. The vegetation in the coastal forest habitat was dominated by beach hibiscus (Hibiscus tiliaceus) with Important Value Index (IVI) 114.49%. In the lowland forest habitat was dominated by meranti (Shorea sp) with IVI 66.71%. Vegetation in plantation habitat consisted of coffee (Coffea robusta) and cacao (Thebroma cacao). Grassland habitat is dominated by species kerawatan (Cyonodon dactylon) and rumput jarum (Andropoghon aciculatus). The total bird species found in four types of habitat were 116 species, comprising 38 families. Twenty-eight species are categorized as protected by Indonesian government regulation No. 7 of 1999, 12 species are listed in the IUCN (Critically Endangered and Near Threatened), and 19 species are listed in CITES (Appendix I and II). The highest bird Diversity Index was found in plantation habitat (H’=2.93). The Evenness Index in four habitat types are distributed evenly. The habitats that have the highest similarity are between lowland forest and plantation habitats (ISJ=0.54). T-test results shows that there is no significant differences among four habitats in terms of birds diversity, it was predicted because of small sample size and a narrow area of research. Bird species in each habitat type has a different level of dominance. Regarding vertical distribution, birds in coastal forest lived in C to E strata. Vertical distribution of birds in lowland forest was found in A to E strata. Vertical distribution of birds in plantation habitat was found from C to E strata. While in grassland habitat birds were only found in E strata. The common bird activities were perching, singing, flying, and walking. Bird activity that was mostly found at coastal forest, lowland forest, and plantation was perching. At grassland habitat, common bird activity was walking.
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Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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