Judul: Kajian Pola Sebaran Spasial dan Keanekaragaman Jenis Vegetasi Pada Daerah Tangkapan Air Taman Wisata Alam Gunung Meja
Abstrak: Taman Wisata Alam Gunung Meja merupakan salah satu dari tujuh kawasan taman wisata yang terdapat di Papua, berjarak 3 km dari pusat kota Manokwari. Selain sebagai sumber air bersih bagi sepuluh persen masyarakat kota Manokwari yang berada di sekitarnya, kawasan ini diperkirakan memiliki keanekaragaman jenis vegetasi yang dapat mewakili sebagian keanekaragaman jenis hutan dataran rendah di kawasan kepala burung pulau Papua (Vogelkoop). Kawasan ini telah mengalami degradasi ekologi yang dicirikan dengan penurunan fungsi hidrologi dan peningkatan luas kawasan degradasi. Kajian ini dilakukan untuk mendeskripsikan pola sebaran spasial dan keanekaragaman jenis vegetasi serta mengidentifikasi faktor-faktor penyebab terjadinya perubahan ekosistem secara khusus pada daerah tangkapan air Taman Wisata Alam Gunung Meja, sehingga dapat memberikan gambaran tentang kekayaan jenis, jenis-jenis dominan, tingkat tutupan tajuk, pola sebaran jenis vegetasi dan faktor-faktor yang mempengaruhi penurunan fungsi daerah tangkapan air, baik dari segi pemanfaatan maupun ekologi guna menjadi acuan di dalam rehabilitasi kawasan guna peningkatan dan pemanfaatan kawasan secara bijak dan lestari.
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Judul: Analisis Ekonomi Wisata Alam Berkelanjutan Taman Wisata Alam (Twa) Gunung Meja Manokwari Papua Barat
Abstrak: Taman Wisata Alam (TWA) Gunung Meja is one of the developing tourist and conservations which is in Manokwari and it has the potency to develope to become the natural tourism area. Now the existance of TWA Gunung Meja is in the crisis condition caused by the society interaction in the area, such as the farming, cutting down the wood, top Soil and rocks, the garbage throw and there is no public fasility and supporting facilities. In the developing of economy analysis can be concluded that TWA Gunung Meja offers the aestetic, various flora and Fauna, Natural Cave, and historical sites.The destiny of tourist to TWA Gunung Meja is to entertain of natural panorama, hiking, caving, researching on flora and Fauna and the visit to the historical sites. The economic value of natural tourism TWA Gunung Meja is IDR 592.154.197 annualy and the value of natural tourism development TWA Gunung Meja is IDR 217.940.375. From social analysis, the society from TWA Gunung Meja is very conducive in supporting and ready to participate by paying to the development program on natural tourism in TWA Gunung Meja. While in the Environment analisys, the maximum amount of tourists who can visit to TWA Gunung Meja without changing the physical condition or to decrease the quality of the environment is 58.092 tourist per visit and maximum capacity for the tourist perday 174.211 persons.
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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