Judul: Pemodelan peluang kebangkrutan dalam asuransi dengan menggunakan proses gamma
Abstrak: Asuransi dalam hukum dan ekonomi adalah bentuk manajemen risiko yang dipakai untuk proteksi terhadap kerugian. Kerugian dalam asuransi terjadi jika besarnya pemasukan lebih kecil dari pengeluaran. Pemasukan asuransi berasal dari penerimaan premi dan modal yang dimiliki, sedangkan pengeluaran berupa pembayaran klaim. Kerugian asuransi dapat mengakibatkan kebangkrutan dalam perusahaan asuransi. Oleh karena itu, karya ilmiah ini bertujuan untuk memodelkan peluang kebangkrutan ke dalam proses Gamma serta melakukan simulasi terhadap jumlah klaim agregat. Peluang kebangkrutan dapat dimodelkan dengan proses Gamma dengan cara mengubah fungsi yang mendefinisikan proses klaim agregat. Dalam simulasi proses klaim agregat, hasilnya sangat dipengaruhi oleh nilai parameter yang digunakan. Besarnya peluang kebangkrutan dalam asuransi dipengaruhi oleh modal awal, nilai relative security loading, dan jumlah klaim agregat. Modal awal dan relative security loading berbanding terbalik dengan peluang kebangkrutan, sedangkan jumlah klaim agregat berbanding lurus dengan peluang kebangkrutan.
Keyword: Premi asuransi, Klaim asuransi, Polis asuransi, Collective risk

Judul: Peluang kebangkrutan perusahaan asuransi dimana besar klaim menyebar gamma (2,β)
Abstrak: The purpose of this thesis is to show that, for the classical risk model, analytical solution for ruin probability can be obtained through solving the differential integral equation. The amount of claims is assumed to have Gamma (2,β) distribution. The numerical result using Mathematica software show that the decrease in ruin probability value is caused by the increase in initial capital or premium loading (δ), and, on the order hand, the corresponding increase is used by the decrease in initial capital or premium loading (δ).
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Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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