Judul: Karakteristik Habitat Populasi Dan Penyebaran Rekrekan (Presbytis Fredericae Sody, 1930) Di Resort Semuncar Taman Nasional Gunung Merbabu
Abstrak: Penelitian ini dilakukan dengan tujuan untuk mengetahui karakteristik habitat, populasi dan penyebaran rekrekan (Presbytis fredericae Sody, 1930). Vegetasi pada habitat rekrekan diketahui dengan metode analisis vegetasi. Metode transek garis digunakan untuk mendeteksi keberadaan satwaliar, predator dan keberadaan populasi rekrekan. Populasi rekrekan yang ditemukan selanjutnya disensus dengan metode terkonsentrasi. Hasil penelitian menunjukan, rekrekan ditemukan pada ketinggian 2 150 - 2 420 m dpl dengan suhu 19 C - 21 C dan kelembaban udara sebesar 89% - 94%. Intensitas cahaya di habitat rekrekan berkisar antara 8 260 lx - 120 831 lx. Vegetasi pada habitat rekrekan didominasi oleh jenis kesowo (Engelhardia serrate). Populasi rekrekan ditemukan sebanyak 2 kelompok dengan total populasi sebanyak 15 individu dan kepadatan populasi sebesar 0,395 individu/km2. Penyebaran rekrekan yaitu pada bukit Bundas, Ndeles, Dok Malang, Dok Cilik, Tulangan dan Pandean.
Keyword: habitat, rekrekan, resort Semuncar

Judul: Pertimbangan ekologis pembangunan fasilitas rekreasi di resort Bodogol Taman Nasional Gunung Gede Pangrango
Abstrak: Dalam rangka mengurangi tekanan terhadap kawasan Cibodas, Gunung Putri, Selabintana, Situgunung dan mengurangi beban jalur wisata puncak, pihak Taman Nasional Gunung Gede Pangrango (TNGGP) bermaksud mengembangkan Resort Bodogol menjadi kawasan rekreasi alam. Penataan letak dan pembangunan fasilitas rekreasi terutama dalam kawasan taman nasional memerlukan beberapa pertimbangan, salah satunya adalah pertimbangan ekologi. Berdasarkan hal tersebut, dilakukan penelitian dengan tujuan untuk mengetahui kondisi biofisik setiap tapak yang akan dibangun fasilitas rekreasi di Resort Bodogol TNGGP untuk keperluan pertimbangan ekologi. Untuk mencapai tujuannya, beberapa hal yang ingin diketahui (1) jumlah jenis flora dan fauna beserta karakteristik ekologinya, (2) jenis tanah dan kesesuaian lahan, kepekaan tanah terhadap erosi, (3) kelerengan, (4) sumber air pada setiap tapak yang akan dibangun fasilitas dan pengembangan kegiatan rekreasi. Penelitian dilakukan pada beberapa lokasi yang akan dibangun fasilitas rekreasi di Resort Bodogol TNGGP, berupa areal berkemah, piknik, bermain dan berkuda. Metode pengumpulan data studi literatur dan observasi. Data flora diperoleh dengan melakukan analisis vegetasi cara garis berpetak, data satwa liar dengan metode perjumpaan langsung (IPA dan transek garis) dan tidak langsung. Data lereng, dengan pengukuran menggunakan abney level. Data tanah, dengan membuat penampang dan pengambilan contoh tanah dengan ring sample pada tiap penggunaan lahan yang berbeda. Pengolahan datanya dalam bentuk penyajian secara deskriptif di tiap lokasi yang diteliti. ...
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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