Judul: IPB (Bogor Agricultural University)
Abstrak: Dairy cattle farming represent one of environment pollution sources in agricultural sector. Most of dairy farming's in Indonesia are managed in the forms of small holder farming's that give more attention to productivity rather than ecological concerns. The purpose of this study was to make models and their behavior of dairy cattle animal waste pollution on clean water quality and degree of smell at several regions with different natural physical and economic social conditions. This study also investigated the animal waste management that match with the farmer's condition in each region. Model compiled based on to component situation of livestock, environment and farmers condition. Data obtained from result of field observation, laboratory analysis and literature and also statistical of relevant institution. Determination of regional sarnpel of sub-province or town until chosen countryside conducted with multistage sampling without randomization (purposive sampling). Model simulation with program of Powesim 2 . 5 ~ . Based on the result of research can be concluded that 1) low natural physical region and low economic social condition had animal waste can to pollute of environment, 2) The waste management for the region with high natural physical and high economic social of bio gas, for regional with high natural phwical and lw social economics is by selling waste go out ranch location, composting for the region with low natural physical and high economic social, and composting accompanied by removing to excess of animal waste for regional with low natural physical and low economic social, 3) high natural physical region had the potential to realize sustainable small holder dairy cattle, while low natural physical region the availibility of water and forage represent aspect which need to get attention.
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Judul: IPB (Bogor Agricultural University)
Abstrak: The main objective of this study was to design an ecofarming model for sustainable farming system on upland agricultural landuse areas, both in Lembang, West Java and Dongko, East Java. The slopes of the land in both areas study were vary between 15%-45%. The first step of the study is aimed to analyze sustainability index of the research areas, using Multi Dimensional Scalling (MDS)-Rapfarm. For the second study, the dynamic system simulation is used as an approach to solve the complexity problem of upland agriculture which is threatened by erosion. The model was constructed by dominant variables as the result of leverage analysis and by five sub models analysis: LEISA (low external input for sustainable agriculture), sustainable agriculture practices, agribusiness-marketing, social capital and government rules. The result of the MDS analysis showed that sustainable multi-dimension index of Lembang district was 35,47 and Dongko district was 24,16. These values indicated that the environmental condition of both study areas were categorized as not sustainable. Estimation of actual erosion rate in Lembang was 147,29 ton/ha/year and in Dongko was 245,95 ton/ha/year. The results of each sub model revealed if LEISA sub model is being implemented, so that the farmers of Lembang district will get benefit from organic matter processing up to Rp 6.844.278.833/year on average, meanwhile the farmers of Dongko distric will get Rp,1.298.287.172/year approximately. The sustainable land management required an integrated management on land conservation, ideal ratio of perennial to annual vegetation as 25%:75%, and minimum livestock per acre for organic matter supply (8 cows/ha or 22 goats/ha). Alternative core-plasma cooperation between agro supplier and farmer is chosen to help the farmers in product marketing, as the market structure is olygopsony. The Government is required to provide more operational policies that clearly distinct the border of protected area and the area that used for agricultural activities such as farming and pasture. Social capital can be conducted by strengthen the local values as a basis for building component of trust, network relationship, and community co-operation. Thus, there were three recommended scenarios of eco-farming model created based on government decision, real condition in the field, and the limitation of community capabilities. Application of this model should be accompanied by an understanding of each sub-model that built the model, including a deep understanding on local values that applied in the communities.
Keyword: Ecofarming, Multi Dimensional Scalling, West Java, East Java

Judul: Kombinasi algoritma sha 1 dan algoritma rsa untuk membentuk tanda tangan digital
Abstrak: Tanda tangan digital termasuk ke dalam teknik kriptografi yang memanfaatkan teknologi kunci publik (enkripsi asimetris). Tanda tangan digital dapat dibuat dengan mengkombinasikan teknik hashing (untuk membentuk message digest dari pesan asli) dan enkripsi asimetris (untuk membentuk kunci publik dan kunci privat). Teknik hashing yang digunakan adalah teknik rashing satu arah dengan menggunakan algoritma SHA 1, sedangkan algoritma RSA digunakan untuk enkripsi asimetris Tulisan ini bertujuan untuk mempelajari, menganalisis, dan mengimplementasikan pembentukan dan verifikasi tanda tangan digital menggunakan dua metode, yaitu dengan mengkombinasikan algoritma SHA 1 dan algoritma RSA dan dengan menggunakan algoritma RSA saja. Analisis yang dilakukan pada kedua algoritma ini meliputi analisis algoritma, dan analisis hasil implementasi. Analisis terhadap algoritma SHA | menunjukkan bahwa algoritma ini memiliki kompleksitas O(n) untuk kasus terburuk. Sedangkan untuk pembentukan kunci publik dan kunci privat dengan algoritma RSA diperlukan beberapa algoritma pendukung, yaitu algoritma Miller Rabin, Witness, Euclid, dan Extended Euclid. Semua algoritma pendukung tersebut memiliki kompleksitas waktu yang sama, yaitu O(k), dengan adalah panjang representasi bit bilangan bulat. Kompleksitas waktu yang didapatkan untuk proses pembentukan tanda tangan digital dengan kedua metode ini adalah sama yaitu O(nk). Untuk proses verifikasi, kompleksitas waktu yang didapatkan dengan menggunakan kombinasi dua algoritma adalah O(1 + k) dan untuk algoritma RSA adalah O(n + k). Pada proses pembentukan tanda tangan digital menggunakan kombinasi dua algoritma yang ditandatangani adalah message digest yang dihasilkan oleh algoritma SHA 1, sedangkan pada algoritma RSA yang ditandatangani adalah pesan itu sendiri. Dari hasil implementasi didapatkan untuk proses pembentukan tanda tangan digital menggunakan kombinasi dua algoritma lebih cepat dibandingkan dengan menggunakan algoritma RSA saja untuk file-file yang berukuran besar, dst
Keyword: Tnda Tangan Digital, Teknik Kriptografi, Enskripsi Asimetris