Judul: Hymenoptera parasitoid diversity at some agricultural landscape type in Cianjur watershed Cianjur district, West Java
Abstrak: The research oh Hymenoptera parasitoid diversity were conducted in upper part (Nyalindung village), middle part (Gasol village) and lower part (Selajambe village) of Cianjur watershed, Cianjur district, West Java, from January 2003 to September 2004. The objective of the research is to study the effect of landscape structure on diversity, richness and distribution of Hymenoptera in Cianjur watershed (middle Citarum sub-watershed).
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Judul: Pengaruh Jarak dari Hutan dan Kondisi Lanskap Pertanian terhadap Keanekaragaman Hymenoptera
Abstrak: Landscape conditions have an enormous role in determining the level of biodiversity. Complexity of habitats has been known to be associated with the increase of spesies richness. The purpose of this research is to study the effect of distance from the forest and agricultural landscapes toward abundance and diversity of hymenoptera in vegetable crops. A survey was conducted in the month of August 2012 until October 2012 at eight different habitats in Cisarua, Megamendung, Tamansari, Caringin and Cigombong from Bogor District. The habitat observed is divided into four criteria: habitats that are located within 0 to 500 m, 500 to 1000 m, 1000 to 1500 m, and 1500 to 2600 m from the forest. Sampling was done by installing 4 to 15 Yellow Pan Trap (YPT) in each locations. Altogether there were 779 individuals belonging to 26 families and 130 species that were collected. Species richness was found in the habitats that are located 1500 to 2600 m from the forest.Based on Shannon's index, the highest diversity was found to be on landscape with the distance of 1000 to 1500 m from the forest (B01) in sub-district Tamansari. Spesies similarity was found to be quite with less than 50% between different habitats. However, species composition between different habitats does not show is any difference. Result of the study does not show that diversity of Hymenoptera is effected by distance from forest instead it is more influenced by conditions and type of agricultural landscapes.
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Judul: Analisis RSA dengan Penambahan Chinese Remainder Theorem untuk Mempercepat Proses Dekripsi.
Abstrak: RSA merupakan algoritma kunci publik yang keamanannya bertumpu pada kesulitan untuk memfaktorkan modulus n yang sangat besar, tetapi kelebihan ini mengakibatkan lambatnya waktu untuk menyelesaikan proses. Penambahan CRT pada RSA diperlukan untuk mengefisienkan kinerja RSA. Penelitian ini bertujuan untuk mempelajari kinerja RSA dari segi kecepatan dan keamanannya, serta menganalisis algoritmanya. Analisis kecepatan dilakukan dengan mengukur waktu kecepatan rata-rata enkripsi dan dekripsi RSA dan RSA-CRT. Analisis keamanan dilakukan melalui studi literatur. Dari hasil analisis algoritma, dapat ditarik kesimpulan bahwa RSA dan RSA-CRT memiliki kompleksitas yang sama untuk algoritma pembangkitan kunci dan proses enkripsi, yaitu O((lg n)3). Tetapi pada pembangkitan kunci RSA-CRT, ada bagian yang kompleksitasnya O((lg (n/2))2). Algoritma dekripsi RSA memiliki kompleksitas O((lg n)3), sedangkan RSA-CRT memiliki kompleksitas O((lg (n/2))3). Hasil ini dikuatkan oleh hasil implementasi yang memperoleh waktu dekripsi RSA-CRT yang lebih cepat dibandingkan waktu dekripsi RSA. Waktu rata-rata running time proses dekripsi RSA adalah 4211.79 ms, sedangkan pada RSA-CRT diperoleh running time rata-rata proses dekripsi 1372.44 ms. Kata kunci : RSA, RSA-CRT, Chinese Remainder Theorem.
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