Judul: Analisis Hubungan Kondisi Iklim Dengan Ledakan Ulat Bulu: Studi Kasus di Kabupaten Probolinggo, Jawa Timur
Abstrak: An outbreak of caterpillars Arctornis submarginata Wlk.(Lep.: Lymantriidae) occured in nine subdistrict of Probolinggo during March-April 2011. The caterpillar caused heavy defoliation on mangoes, with a total of 14.813 trees affected. Pest populations are commonly strongly influenced by the dynamics of climatic factors. The research aimed to evaluate and analyze the relationship between climatic conditions and the outbreaks of caterpillars. We used a qualitative-descriptive method to analyze rainfall variation for 10 years in the area, regression analysis of climatic factors and pest severity, and climex software to analyze potential pest distribution. Our analysis showed a strong relationship between outbreak of caterpillars and a high rainfall in the study area. The monthly average of rainfall for January to April was higher than monthly rainfall for 10 years. Based on regression analysis, the strongest influence of the whole climatic factors was found on the larval stages of which the value of R2 is 28.9%. Analysis using software climex showed the value of EI (Ecoclimatic Index) is 92, 87 and 46 in compare location, indicating that the study area was more suitable for the caterpillars. Climate is one of the factors affecting caterpillar outbreaks, in addition to biotic factors such as natural enemies.
Keyword: 

Judul: Analisis hubungan faktor iklim dengan tingkat serangan wereng batang cokelat (Nilaparvata lugens Stal.) sebagai landasan prediksi serangan: studi kasus pada 3 Kabupaten di Provinsi Jawa Tengah
Abstrak: Pests are organisms that can cause damage to plants and can adversely affect the economy. Rice is the most important staple food in Indonesia. One of destructive pest of rice plants which can reduce the production is brown planthopper (Wereng Batang Coklat – WBC). One of the triggers widespread increase in attacks of WBC is the climatic factor. Climatic factors can influence the level of attacks of the pest. Therefore, the influence of climate on broad attack WBC is important to be analyzed. This study aims to analyze the relationship between climatic factors with a broad attack WBC as a basis for prediction of attack. The areas of studies covered 3 district of Central Java Province,e.g., Cilacap, Pekalongan, and Tegal. The method used for analysis linear regression method for rainfall, quadratic regression to other climatic factors, and multiple linear regression to all the climatic factors that possible influence. Analysis of climatic factors with broad WBC relationships attacks carried out at different time delay (lag time) those are without lag, lag 1 and lag 2. The highest determinate coefficient results between regions of WBC attacks and climatic factors is 20.2%. These results obtained when the analysis is done in lag 1 with the equation of LS (Area Of Attack) = - 38 + 90.2 Tavg - 36.0 Tmax - 61.6 Tmin - 0146 R + 3.11 RH. Climatic factor is one of the factors that influence the broad attack of WBC, there are several other factors that need to be included in the analysis to improve results and get a better prediction.
Keyword: 

Judul: Simulasi Protokol Autentikasi Pelanggan pada Voice Privacy
Abstrak: Existing design of the telephone public network is susceptible to eavesdropping on its voice stream. Consequently, any wire taper can listen to supposedly private conversation. In order to prevent such eavesdropping, we propose a protocols and its implementation for end-to-end voice privacy authenticate as a service available for interested subscribers. Our protocols consist of customer enrollment system, customer authentication system and simulation voice privacy. Protocols that we made are adaptation from Sharif and Wijekesera journal with the title Providing Voice Privacy as a Service over the Public Telephone Network. The result of the process shows how the customer enrolls and how the system process the password, how the system authenticate customer simulate voice privacy.
Keyword: