Judul: Intensitas komunikasi petani daerah penyangga kawasan Taman Nasional dalam melakukan konservasi tanah dan air secara berkelanjutan: kasus pada empat desa binaan Taman Nasional Gunung Gede Pangrango, Provinsi Jawa Barat
Abstrak: The aims of this study are to analysis farmer characteristic factors, environment factor and farmer intensity of communication that influence farmers behavior in sustainability land and waters conservation in buffer zone of Gunung Gede Pangrango National Park of conservation area. This research was done in four villages in buffer zone conservation area of Gunung Gede Pangrango National Park of West Java Province. It start since May until August 2007 with total sample are 120 respondents. Collecting primier data was done by observation and reinterview. In other that secondary data was collecting by documents and reports from the relevant institution. To analysis data were used SPSS program. Results of this research show that ages characteristic factors, experience level, and belonging mass media are real influence and significant into communication intensity. Environmental factors is real influence and significant into communication intensity. Beside that, environment factors in farmer business of technology variable of conservation, farmer business organization, and social culture value are real influence and significant into farmer behavior of knowledge aspect and action in sustainability land and waters conservation. Intensity of farmers communication is real influence and significant into farmers behavior (like knowledge, affective, and action) in buffer zone are of conservation area of Gunung Gede Pangrango National Park in sustainability land and waters conservation.
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Judul: Gaya Komunikasi Pemimpin dan Keefektifan Kelompok Tani dalam Melaksanakan Program Konservasi Tanah dan Air Kasus Di DAS Ciliwung Hulu, Kecamatan Cisarua, Bogor
Abstrak: Generally, soil and water conservation program in Indonesia generally and in Upper Ciliwung Watershed especially, put a farmers group as executor in the fields. Considering this situation, the key success factor for soil and water conservation measures is how far effectiveness of farmers group in executing these activities. The objective of this research are: (1) to identify farmers group effectiveness in executing soil and water conservation activities; (2) to analyze a relationship between communications style of farmers group leader and farmer group’s effectiveness in executing soil and water conservation measure; (3) to analyze a relationship between communication style of farmers group leader and a maturity and characteristics of farmers group members. This research was designed as descriptive co relational. Primer data was collected through interviewed to four farmers group members in four villages in Cisarua Sub District in Bogor Regency with 161 respondents. The collected data were analyzed by Correlation Spearman Test. The main results of this research show: (1) the farmer groups in Upper Ciliwung have a good effectiveness; (2) communication style of the farmers groups leader are tend to linier; and (3) farmer groups members are paternalistic performance. Convergence communication style conducive for achieving farmer groups’ effectiveness. Convergence communication style of farmer group’s leader tend to be applied in the maturity of farmer groups members. This communication style able to promote farmer groups participation in conservation activities. The farmer group leaders tend to apply convergence communication style when: (1) member of farmer groups have a good income; (2) member of farmer groups use convergence communication; and (3) member of farmer groups have several jobs, which need certain skill.
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Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice