Judul: Rehabilitation-based Mangrove Ecotourism Development Strategy in Tanjung Burung, Tangerang
Abstrak: Ekosistem mangrove di pesisir Tanjung Burung, Tangerang mengalami kerusakan akibat konversi lahan mangrove menjadi area tambak, pemukiman dan industri sehingga menyebabkan ancaman untuk keberlanjutan ekosistem mangrove di Tanjung Burung. Melihat kondisi tersebut, pihak pemerintah beserta stakeholder telah melakukan berbagai upaya rehabilitasi untuk memulihkan ekosistem mangrove. Rehabilitasi mangrove sudah mulai terbentuk namun dalam pemanfaatannya masih terbatas sehingga diperlukan suatu konsep strategis untuk memanfaatkan dan melestarikan ekosistem mangrove. Luas lokasi penelitian sekitar 28 ha sebahagian berasal dari tanah timbul (akresi) yang terbentuk dari timbunan sampah plastik. Tujuan penelitian yaitu menyusun strategi pengembangan ekowisata mangrove melalui persyaratan rehabilitasi di Desa Tanjung Burung, Kecamatan Teluk Naga Kabupaten Tangerang, dengan tujuan khusus sebagai berikut (1) menganalisis kondisi kerusakan ekosistem mangrove (2) Merancang upaya rehabilitasi mangrove. Metode yang digunakan dalam sampling mangrove adalah transek kuadrat dengan peletakan transek selang seling tegak lurus dengan garis pantai. Data wisatawan dan kelembagaan diperoleh melalui wawancara dengan pengambilan contoh responden menggunakan metode purposive sampling. Metode analisis yaitu Daya Dukung Kawasan (DDK), Indeks Kesesuaian Wisata (IKW), Willingness to Pay (WTP), Travel Cost Method (TCM), Interpretive Structural Modelling (ISM). Mangrove yang teridentifikasi di Tanjung Burung sebanyak 11 jenis mangrove yang menjadi habitat biota asosiasi berbagai organisme lain. Indeks Kesesuaian Wisata (IKW) dari tujuh stasiun penelitian termasuk dalam ketegori tidak sesuai (S3) seluas 28 ha. Apabila upaya rehabilitasi dapat dilakukan secara optimal, maka Indeks Kesesuaian Wisata (IKW) dapat berubah menjadi kategori sesuai dengan nilai Daya Dukung Kawasan (DDK) 229 orang/hari. Nilai rata-rata WTP RP 21.425,00 dengan jumlah pengunjung 200 orang/tahun sehingga nilai manfaat keberadaan ekowisata mangrove Rp 4.285.000,00 per tahun. Strategi pengembangan ekowisata mangrove di Tanjung Burung berdasarkan metode Interpretative Structural Modelling (ISM) dapat dicapai dengan memperhatikan elemen tujuan, kendala, program yang dibutuhkan dan lembaga yang berperan. Tujuan utama yaitu menjaga kelestarian ekosistem mangrove, dengan mempertimbangkan kendala yang paling berpengaruh yaitu rendahnya partisipasi lembaga setempat dalam sosialisasi dan pelatihan mangrove serta tingkat pertumbuhan dan kelulushidupan mangrove. Tercapainya tujuan dibutuhkan program strategis yaitu peningkatan rehabilitasi ekosistem mangrove dengan melibatkan lembaga terkait., The mangrove ecosystem on the coast of Tanjung Burung, Tangerang, is damaged due to the conversion of mangrove land into ponds residential and industrial areas, causing a threat to the mangrove ecosystem in Tanjung Burung. Due to these conditions, the government and stakeholders have made various rehabilitation efforts for the mangrove ecosystem. Mangrove rehabilitation has begun to take shape, but its utilization is limited; a strategic concept is needed to utilize the mangrove ecosystem. The study area is about 28 ha, part of which comes from accretionary soil formed from heaps of plastic waste. The objective of this research is to develop a strategy for developing mangrove ecotourism through rehabilitation requirements in Tanjung Burung Village, Teluk Naga District, Tangerang Regency, with the following specific objectives (1) analyzing the damaged condition of the mangrove ecosystem, and (2) designing mangrove rehabilitation efforts. The method used in sampling mangroves is a quadratic transect with alternating transects laying perpendicular to the shoreline. Tourist and institutional data were obtained through interviews with respondents taking samples using the purposive sampling method. The analytical methods that were used in this study are
Keyword: Ekowisata, kesesuaian wisata, mangrove, Interpretive Structural Modelling (ISM)

Judul: Strategi Pengelolaan Kawasan Mangrove Berbasis Lingkungan Fisik dan Sosial di Desa Muara, Kabupaten Tangerang
Abstrak: Conversion of mangrove area into aquaculture land is one of the biggest causes of degradation of mangrove areas. Conversion of mangrove area and the area of ponds which not used again resulted in increasing numbers of mangrove area were damaged and open. In general, reduction of mangrove forests as a result of land conversion have an impact are quite complex, such: the coastline erosion, high tide, flooding due to rain, declining water quality, and in the end lead to a decrease in overall environmental quality. Therefore, environmental management and conservation of mangrove forest ecosystems it is very necessary to make improvement of environmental quality in mangrove areas. Based on those reasons, this study aims to: 1) identify the vulnerability of degradation of mangrove areas in the Village of Muara, Tangerang; 2) identify environmental factors (supporting and inhibiting) that effect on the rehabilitation of mangrove areas in the Village of Muara and formulate the strategy of rehabilitation. The study was conducted in the village of Muara, subdistrict of Teluknaga, district of Tangerang, Province of Banten. The data used in this study consisted of primary data and secondary data. The primary data obtained through sampling, field surveys and interviews. Secondary data were obtained by collecting data and information required from various related institutions. Analyzer which used in this study consisted of: analysis of vegetation, analysis of the vulnerability of mangrove degradation, descriptive analysis of environmental factors, and A'WOT analysis (combined AHP and SWOT) to formulate rehabilitation strategies of mangrove. The results showed that the mangrove areas Muara experienced a high level of vulnerability of degradation based on mangrove vegetation characteristics. Mangrove vegetation in Muara has a level of low density, levels of low species diversity and levels of high dominance. There are six mangrove species which was found in mangrove areas Muara, that is Avicennia alba, Avicennia officinnalis. Rhizophora apiculata, Rhizophora stylosa, Rhizophora mucronata, and Nypa fruticans. Mangrove species with the highest INP present in Rhizophora mucronata. Rehabilitation process of mangrove by revegetation methods are needed, wherein, species of mangrove that are used in revegetation process are local species which the seeds can be found in the mangrove areas of Muara. Physical environmental conditions of mangrove areas in Muara are generally still suitable for of mangrove growth. Rural communities in Muara showed a positive perception and attitude towards mangrove rehabilitation activities that conducted in their village. Based on analysis of the relationship between the factors that conducted in the A'WOT analysis, there are three (3) alternative strategies that be a priority to succeed the mangrove rehabilitation program in mangrove areas of Muara, namely: 1) Promoting Muara as one of the educational tourist attractions for mangrove; 2) Involvement and empowerment of communities in each of the process of rehabilitation and conservation of mangrove; 3) Making the Village of Muara as a supplier of mangrove seedlings for mangrove rehabilitation and conservation in coastal areas of Jakarta
Keyword: mangrove, mangrove rehabilitation, mangrove ecosystems, rehabilitation strategies

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