Judul: Kajian Pengembangan Ekowisata Mangrove Di Kawasan Konservasi Pelabuhan Tengkayu II Kota Tarakan Kalimantan Timur
Abstrak: Hutan mangrove di kawasan Pelabuhan Tengkayu II merupakan kawasan konservasi dan wisata yang berlokasi berdekatan dengan pusat Kota Tarakan. Permasalahan yang muncul diantaranya minimnya peran serta masyarakat sekitar dan kerjasama dengan pihak-pihak terkait di sekitar kawasan yang mempengaruhi kondisi hutan mangrove, masih terjadi perusakan mangrove dan pembuangan sampah/limbah di sekitar lokasi baik oleh masyarakat dan pengunjung, fasilitas untuk pendidikan dan penelitian seperti pusat informasi, perpustakaan dan penerangan tentang hutan mangrove belum memadai serta masih rendahnya pendapatan pemerintah daerah dari kawasan ini. Penelitian ini mengkaji potensi hutan mangrove diantaranya jenis, kerapatan, frekuensi dan dominansi dengan metode kuadrat, fauna hutan mangrove dengan metode visual dan hasil penelitian dari berbagai instansi, kondisi sosial ekonomi masyarakat dan pengunjung yang datang termasuk pendapat mereka mengenai pengembangan ekowisata dengan wawancara dan kuisioner, daya dukung kawasan bagi kegiatan ekowisata dengan metode PCC (Physical Carrying Capacity). Selanjutnya menilai kelayakan pengembangan kegiatan ekowisata di lokasi berdasarkan kriteria Direktorat Wisata Alam dan Pemanfaatan Jasa Lingkungan. Menyusun strategi untuk pengembangan ekowisata mangrove di kawasan Pelabuhan Tengkayu II yang berkelanjutan dengan analisis SWOT.
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Judul: Pengembangan Kegiatan Wisata Kawasan Mangrove Berbasis Konservasi di Kota Pekalongan, Jawa Tengah
Abstrak: Taman Mangrove Pekalongan dibangun dengan tujuan untuk memperbaiki atau merehabilitasi kawasan pesisir yang terus mengalami abrasi. Oleh karena itu perlu adanya pengembangan wisata di Taman Mangrove Pekalongan yang sesuai dengan ekowisata. Penelitian ini dilakukan dengan tujuan untuk menganalisis potensi ekosistem mangrove, menganalisis penilaian sumberdaya dan permintaan wisata untuk menentukan pengembangan kawasan di Taman Mangrove Pekalongan. Penelitian ini dilakukan pada Bulan April hingga Juni 2016. Analisis yang digunakan yaitu kesesuaian wisata, daya dukung kawasan, travel cost method, dan willingness to Pay. Total daya dukung kawasan adalah 48 orang/hari. Tingkat kunjungan Taman Mangrove Pekalongan dipengaruhi secara negatif oleh biaya perjalanan. Faktor yang mempengaruhi pengunjung dalam melakukan wisata ke Taman Mangrove Pekalongan adalah jarak. Pengembangan yang dilakukan di Taman Mangrove Pekalongan adalah penetapan harga tiket masuk, meningkatkan fasilitas dan melibatkan masyarakat lokal dalam mendukung kegiatan wisata dan perluasan area mangrove.
Keyword: ekowisata, mangrove, pengembangan, Taman Mangrove Pekalongan

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