Judul: Studi permintaan rekreasi di wana wisata pantai Logending, Kabupaten Kebumen
Abstrak: Dewasa ini kebutuhan rekreasi di alam terbuka cenderung mengalami peningkatan. Hal-hal yang melatarbelakangi kenyataan tersebut adalah peningkatan taraf hidup masyarakat, semakin membaiknya sistem komunikasi dan transportasi serta pertambahan jumlah penduduk. Adanya peningkatan kebutuhan akan rekreasi di alam terbuka menyebabkan tempat-tempat rekreasi di alam terbuka semakin banyak dikunjungi. Salah satu tempat rekreasi yang banyak dikunjungi adalah Wana Wisata Pantai Logending. Wana Wisata Pantai Logending sebagai salah satu tujuan wisata di Kabupaten Kebumen memiliki peranan yang penting untuk memenuhi kebutuhan rekreasi di alam terbuka. Untuk itu, studi permintaan rekreasi perlu dilakukan guna mengetahui pola permintaan rekreasinya. Hal ini diharapkan dapat mem- bantu pengelola untuk mengoptimalkan pemanfaatan dan pengembangan Wana Wisata Pantai Logending. Tujuan penelitian terdiri atas (1) mengetahui karakteristik pengunjung Wana Wisata Pantai Logending (2) menguji faktor-faktor yang berpengaruh permintaan rekreasi di Wana Wisata Pantai terhadap Logending (3) mengetahui tingkat pendapatan dan biaya rekreasi pengunjung Obyek Wisata Gua Jatijajar dan Gua Petruk (4) mengetahui minat untuk berkunjung kembali ke Wana Wisata Pantai Logending dan faktor penghalang pengunjung Obyek Wisata Gua Jatijajar dan Gua Petruk untuk berkunjung ke Wana Wisata Pantai Logending.
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Judul: Analisis Permintaan Rekreasi dan Strategi Pengembangan Wisata Bahari "Pantai Kalianda Resort", Kabupaten Lampung Selatan, Provinsi Lampung
Abstrak: Permintaan rekreasi wisata bahari merupakan jumlah permintaan masyarakat terhadap suatu obyek wisata bahari. Untuk menduga jumlah permintaan rekreasi dapat dilakukan dengan pendekatan Metode Biaya Perjalanan (Travel Cost Method). Obyek wisata Pantai Kalianda Resort memiliki panorama alam yang indah dan ditunjang dengan beberapa atraksi wisata dan fasilitas-fasilitas wisata yang tergolong cukup lengkap. Tujuan penelitian adalah mengidentifikasikan karakteristik pengunjung obyek wisata, menduga kurva permintaan masyarakat terhadap rekreasi wisata bahari, dan merumuskan alternatif strategi pengembangan wisata bahari Kalianda Resort, Kabupaten Lampung Selatan.
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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