Judul: Pest and Disease Incidences on Rice (Oryza sativa L.) Organic Farming System
Abstrak: Excessive utilization of both synthetic chemical fertilizers and pesticides in conventional farming system so far has created many problems such as environmental pollution, plant pest and disease resistance and resurgence, health problems, etc. These adverse effects promoted the conversion movement of farming system from conventional to organic. Modern organic farming system encourages farmers to use organic fertilizers, to control plant pests and diseases by using biological agents and cultivation management. The objectives of the research were (1) to analyze the incidence of pest and disease on the rice organic farming system, and (2) to know the effect of the organic farming system on diversity and abundance of arthropods and microorganism. The research was conducted in Situgede village, Bogor, West Java in two planting seasons that were rainy and dry seasons of 2007/2008. The treatments included five farming systems i.e. conventional (using urea 200 kglha, TSP 100 kg/ha, KCl 100 kglha and synthetic chemical pesticide); low-input (using bokashi 1 tonlha, urea too kglha, TSP 50 kg/ha, KCl 50 kg/ha and synthetic chemical pesticide); organic-5 (using bokashi 5 tonlha, without anorganic fertilizer and synthetic chemical pesticide); organik-lO (using bokashi 10 tonlha, without anorganic fertilizer and synthetic chemical pesticide); SRI (similar with organic-5, but different in irrigation and planting system). The result of the study showed that the incidences of pests and diseases in organic farming systems were almost the same as in those of conventional farming systems, either in rainy or dry season. Furthermore, diversity and abundance of arthropods and microorganism on organic farming system were higher than those of the conventional one. Ecosystem on organic farming system was likely more suitable for and therefore promoted the development of beneficial organisms. It was also found that organic farming systems were more profitable than the conventional ones.
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Judul: Comparative Analysis of Techincal Efficiency of Semi Organic and Conventional Rice Farming in Bogor [Case in Situ Gede and Sindang Barang Villages].
Abstrak: Rice is a sub sector of agriculture and economic that very important and strategics. The needed for food is increasing from year to year. This is because increasing of population. An increasing number of needs caused the government to implement the green revolution program to increase rice productivity. However, the application of green revolution give impact to environmental pollution due to the use of chemical fertilizers and pesticides. Impact of pollution caused by use of chemicals for agriculture cause people aware with environment and health. West Java is one of Indonesia's rice-producing areas. However, rice cultivation in West Java still use chemical fertilizers and pesticides and several new areas to develop organic farming. Areas that have started organic farming one of them in the city of Bogor, which is in Situ Gede Village, Sindang Barang Village, and Mulyaharja Village.Because there are still many problems to become the organic rice so that only Situ Gede village that is still developing semi organic rice until now. Nevertheless, Bogor city government is developing organic rice farming program again. However, because there are some provisions that must be fulfilled to be organic rice so few producers called the organic rice with semi organic or healthy rice. Production and income of semi organic rice farmers organic not fully in line with expectations. Semi organic rice production is still low (about 5-6 tonnes/ha) so that farmers incomes were low. Besides that, sometimes semi organic rice prices are still the same as conventional rice prices because of marketing uncertain. Indicated that a narrow planting area causing less efficient farmers in cultivation. Organic rice cultivation by semi-organic rice farmers indicated was not efficient due to the high cost of producing organic rice, farmers' income levels are still low, rice production is still below potential output and the price of organic rice that is not much different even with rice conventional. To reach organic rice farming takes time, long proces and sustainable process. This study aims: (1) to analyze the factors that influence semi organic and conventional rice farming, (2) to analyze technical efficiency semi organic and conventional rice farming and (3) to analyze rice farming income between semi organic and conventional rice farming. To answer these research purposes the data were analyzed qualitatively and quantitatively with stochastic frontier Cobb Douglas production function. The estimation results of stochastic frontier production function semi organic rice farming, the production function models considered fit for fulfilling the assumption of Cobb-Douglas. Estimation results of the production function with the MLE method shows that there are three variables with a positive and significant coefficient on rice production is semi organic land area, elements of K and organic pesticides. Land use positively and significantly with the elasticity of 0.994 indicates that the addition of 1% land area will increase rice production amounted to 0.994% with other factors held constant. The elasticity of the element K to the production of 0.005 showed that the addition of elements of K by 1% would increase rice yield by 0.005% with other factors held constant. Botanical pesticides variable positive and significant
Keyword: stochastic frontier, organic farming, production, inefficiency

Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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