Judul: Kajian Potensi dan Daya Dukung Ekowisata di Kawasan Cagar Alam Pulau Sempu Jawa Timur
Abstrak: Pulau Sempu Nature Reserve (PSNR) has become a popular destination for ecotourism in East Java. The ecotourism activities pose management issue related to the status of the area. According to its status as a nature reserve, the tourisme and other activities entering the site is forbidden except for education, research and development of science. Nevertheless, the visitor numbers increase by time and can’t be avoid. The pressure of this tourisme demand will affect the declining of quality and quantity of the PSNR biodiversity resource, soon will threaten its sustainability. Strategic plans need to deal with the problems, to optimize the value and function of the site. The reseach was conducted : (1) To identify and analyze potential objectives of natural tourist attraction in PSNR (2) To analyze its carrying capacity regarding the impacts of tourism activities (3) To formulate a strategic plan of PSNR according to its potency and status. The research was taken for 6 months on October 2012 until March 2013. Field observation and multistakeholder deep-interview was taken to gain data. Potency assessment analysis conducted to assess objectives of natural tourist attraction in PSNR. Carrying capacity analysis based on criteria and indicators of site situation which is ecotourism doesn’t affect physically to the site resources. The SWOT analyse was used to formulate the strategic management plan. The result from analysis of objects assessment of natural tourist attraction (ADO-ODTWA) showed that PSNR is very potential to be developed as ecotourism destination with 85,41% land attraction and 83,33% beach attraction. The main attraction is a uniqe phenomenon lagoon called Segara Anakan, biodiversity and its ecosystem. Those attractions have not supported by some facilities i.e accommodation, institution element, infrastructure, management and service, accessibility, and declining of environmental quality. The carrying capacity limited by factors i.e slope, type of soil against erosion sensitivity, landscape potency, climate, wildlife disturbance index. The recent visit assessed were below the standard carrying capacity especially in “blok rimba” management plan of PSNR. In the future the management authority (BBKSDA Jawa Timur) should notice and hold up management standard based on ecotourism. The SWOT analysis result as the strategic management plan based on ecotourism, 1) Management policy is to divide the “blok inti” and “blok rimba” to prevent the lost of biodiversity and its ecosystem function 2) To evaluate the recent status as basic proposal to change the recent status from of nature reserve to natural park 3) Fully improve coordination to Malang regency as local institution to improve management of PSNR 4) Develop ecotourism based on its potency 5) Develop management collaboration with all stakeholder especially the people of Sempu as local resident.
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Judul: Kajian Potensi Sumberdaya Situ Wanayasa untuk Pengembangan Ekowisata di Kabupaten Purwakarta, Jawa Barat
Abstrak: Penelitian ini bertujuan untuk mengetahui potensi ekowisata dan permasalahan yang terdapat di kawasan Situ Wanayasa, mengidentifikasi kesesuaian dan daya dukung kawasan dan menentukan alternatif strategi dalam pengelolaan dan pengembangan Situ Wanayasa secara optimal. Analisis data yang digunakan adalah analisis potensi wisata, kesesuaian wisata, daya dukung kawasan dan SWOT. Penelitian ini berlangsung dari bulan April sampai Mei 2009 di Situ Wanayasa. Potensi wisata Situ Wanayasa mencakup kualitas air, pemandangan alam, daya tarik flora, budaya dan sosial masyarakat yang terdapat di sekitar kawasan. Secara umum potensi wisata tersebut mendukung dan cocok untuk pengembangan kegiatan wisata. Berdasarkan analisis kesesuaian wisata, kegiatan memancing dapat dilakukan di lokasi tiga, bersepeda air di lokasi satu dan berperahu di lokasi dua. Lokasi empat dapat digunakan untuk duduk santai, lokasi lima untuk kegiatan outbond, lokasi enam untuk berkemah. Pada bagian lokasi empat dan enam dapat dibuat sarana untuk kegiatan flying fox. Daya dukung kawasan Situ Wanayasa sebesar 371 orang/hari. Pada lokasi satu, jumlah maksimum wisatawan yang dapat ditampung sebesar 54 orang/hari. Pada lokasi dua, daya dukung kawasan sebesar 66 orang/hari. Maksimum 37 wisatawan/hari dapat ditampung di lokasi tiga untuk memancing. Kegiatan duduk santai di lokasi empat memiliki nilai daya dukung kawasan sebesar 106 orang/hari. Lokasi lima dapat menampung wisatawan sebanyak 41 orang/hari, sedangkan lokasi enam untuk kegiatan berkemah memiliki daya dukung sebanyak 34 orang/hari. Adapun jumlah wisatawan yang dapat ditampung oleh lokasi yang potensial untuk flying fox adalah 32 orang/hari. Berdasarkan analisis SWOT didapatkan pengembangan dan pengelolaan yang merupakan prioritas utama strategi alternatif pengelolaan kawasan yaitu peran serta instansi terkait dalam melakukan pengoptimalkan pengembangan potensi sumberdaya kawasan namun perlu kesesuaian tata letak dan ruang serta tidak melebihi daya dukung kawasan.
Keyword: Ecotourism potential, carrying capacity, SWOT, area management

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