Judul: Jasa Ekosistem untuk Pengelolaan Mangrove di Desa Apar, Kecamatan Pariaman Utara, Sumatera Barat
Abstrak: Ekosistem mangrove adalah kelompok vegetasi yang tumbuh dan berkembang pada daerah pasang surut pantai berlumpur yang masih mendapat cukup aliran air dan dipengaruhi oleh sifat-sifat fisik laut. Ekosistem mangrove memiliki jasa ekosistem yang tinggi. Penelitian ini bertujuan mengidentifikasi jasa ekosistem dan merumuskan langkah pengelolaan ekosistem mangrove di Desa Apar. Jasa ekosistem mangrove dianalisis dengan metode deskriptif dan dilihat dari kekurangan dan kelebihan dari masing-masing jasa ekosistem. Jasa ekosistem mangrove utama yang berhasil diidentifikasi adalah perikanan tangkap, penyerap karbon, produktivitas primer, dan ekowisata. Langkah pengelolaan untuk ekosistem mangrove Desa Apar adalah dengan melakukan penambahan penanaman mangrove, pembatasan jumlah kunjungan sesuai daya dukung serta penentuan harga tiket untuk ekowisata, dan memperbaiki sarana kawasan ekowisata. Kata kunci: jasa ekosistem, Pariaman, pengelolaan mangrove, valuasi ekowisata. ABSTRACT NADIA REVIANDA Ecosystem Services for Mangrove Management in Apar Village, North Pariaman, West Sumatra. Supervised by ACHMAD FAHRUDIN and AGUSTINUS M SAMOSIR. Mangrove ecosystem is a group of vegetation that grows and develops in muddy coastal tidal area that still get enough water flow and influenced by the physical properties of the sea. It has high ecosystem services. This study aims to identify ecosystem service and formulate management of mangrove ecosystems in Apar Village. Ecosystem services were analyzed using descriptive method, while management measures were formulated from advantages and disadvantages of services and the valuation. Main mangrove ecosystem services that had been identified were fisheries capture, carbon sink, primery productivity, and ecotourism. Based on those the management measuired planed were mangrove planting, importing carrying capacity and ticket prices, and improving ecotourism facilities.
Keyword: jasa ekosistem, Pariaman, pengelolaan mangrove, valuasi ekowisata

Judul: Socio-Ecological System of Mangrove Ecotourism in Pari Island, Seribu Island, DKI Jakarta
Abstrak: Ekosistem mangrove adalah ekosistem pesisir yang dimanfaatkan sebagai olahan pangan, perikanan, dan ekowisata. Tujuan penelitian ini adalah mengidentifikasi komponen sistem sosial ekologi, mendeskripsikan pemanfaatan serta faktor-faktor pendukung pengelolaan mangrove Pulau Pari, Kepulauan Seribu. Pengumpulan data diperoleh dengan pengukuran kerapatan mangrove dan kualitas air pada 3 stasiun. Wawancara dilakukan kepada masyarakat, wisatawan, dan pengelola wisata. Analisis data terdiri dari analisis kerapatan mangrove, konektivitas sistem sosial ekologi, analisis pemangku kepentingan, dan analisis strategi pengelolaan mangrove. Hasil menunjukkan bahwa komposisi mangrove di Pulau Pari tergolong dalam kategori sedang dengan spesies yang mendominasi adalah Rhizophora stylosa. Konektivitas yang terjadi pada sistem sosial-ekologi ekowisata mangrove menunjukkan bahwa peran resources governance masih minim. Rekomendasi pengelolaan yang penting untuk dilakukan yaitu kerjasama pemerintah dengan masyarakat pulau sebagai aktor yang turut serta mengelola ekosistem., Mangrove ecosystems are coastal ecosystems that are utilized as processed food, fisheries, and ecotourism. The purpose of this study was to identify the components of the social ecological system, describe the utilization and supporting factors of mangrove management on Pari Island, Kepulauan Seribu. Data collection was obtained by measuring mangrove density and water quality at 3 stations. Interviews were conducted with the community, tourists, and tour managers. Data analysis consists of mangrove density analysis, social ecological system connectivity, stakeholder analysis, and mangrove management strategy analysis. The results showed that the composition of mangroves on Pari Island was classified as moderate with the dominating species being Rhizophora stylosa. The connectivity that occurs in the social-ecological system of mangrove ecotourism shows that the role of resource governance is still minimal. Management recommendations that are important to do are government cooperation with the island community as actors who participate in managing the ecosystem.
Keyword: connectivity, ecotourism, mangrove, Pari Island

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