Judul: Community Perceptions and Abrasion Control Efforts in Pantai Bakti Village, Muaragembong, Bekasi Regency
Abstrak: Penelitian ini bertujuan menganalisis persepsi masyarakat abrasi dan upaya pengendalian abrasi di Desa Pantai Bakti. Metode yang digunakan dalam penelitian ini yaitu metode observasi, wawancara, dan plot kuadrat. Penelitian ini melibatkan 31 responden yang dipilih secara purposive sampling. Masyarakat Desa Pantai Bakti mengandalkan sektor perikanan (tambak dan laut), pertanian (sawah), dan wisata (pesisir pantai). Hasil penelitian menunjukkan bahwa responden memiliki pengetahuan tentang hutan mangrove dan abrasi. Mayoritas responden (80,6%) memiliki tingkat persepsi tinggi abrasi dari aspek ekonomi, lingkungan, dan budaya. Kondisi vegetasi mangrove yang tumbuh di sempadan pantai didominasi oleh jenis Avicennia marina memiliki kerapatan sangat padat dengan rata rata tingkat kerapatan sebesar 14.620 ind/ha dengan rata rata INP sebesar 250%. Upaya pengendalian abrasi di Desa Pantai Bakti yaitu penanganan abrasi secara vegetatif berupa penanaman mangrove, dan penanganan abrasi secara teknik sipil berupa pembuatan tanggul, pembuatan pemecah ombak, dan pengerukan pasir., This research aims to analyze community perceptions of abrasion and abrasion control efforts in Pantai Bakti Village. The methods used in this research are observation, interview, and quadrat plot method. This research involved 31 respondents selected by purposive sampling. The community of Pantai Bakti Village relies on the fisheries sector (ponds and sea), agriculture (rice fields), and tourism (coastal). The results showed that respondents had knowledge about mangrove forests and abrasion. The majority of respondents (80.6%) had a high level of perception of abrasion from economic, environmental and cultural aspects. The condition of mangrove vegetation growing on the coastal border is dominated by Avicennia marina species which has a very dense density with an average density level of 14,620 ind/ha with an average INP of 250%. Abrasion control efforts in Pantai Bakti Village are vegetative abrasion handling in the form of mangrove planting, and abrasion handling in civil engineering in the form of embankment construction, wave breaking, and sand dredging.
Keyword: ekonomi, mangrove, persepsi, pengaruh, penilaian, assessment, economy, influence, perception

Judul: Mangrove Rehabilitation Strategy based on Community Perception in Pantai Bahagia Village, Muara Gembong District
Abstrak: Ekosistem hutan mangrove merupakan suatu ekosistem hutan yang memiliki peran penting dalam menunjang berbagai aspek di Desa Pantai Bahagia. Degradasi hutan mangrove di Desa Pantai Bahagia dapat menyebabkan abrasi yang berdampak buruk bagi masyarakat sekitar. Rehabilitasi hutan mangrove perlu dilakukan dengan mengetahui persepsi masyarakat sebagai salah satu faktor penting dalam rehabilitasi lahan. Tujuan dari penelitian ini adalah merumuskan strategi rehabilitasi mangrove di Desa Pantai Bahagia berdasarkan persepsi masyarakat. Hasil penelitian ini menunjukan bahwa masyarakat memiliki persepsi pengetahuan dan sikap yang tinggi terhadap rehabilitasi mangrove. Strategi yang tepat dalam rehabilitasi mangrove oleh BKPH Ujungkrawang adalah strategi WT yaitu mengatasi konflik di dalam kawasan dan meningkatkan kapasitas sumberdaya unit pengelolaan, agar unit pengelolaan lebih siap untuk mengakomodir masyarakat dan juga pihak lain yang telah melakukan kegiatan penanaman dalam rehabilitasi mangrove di Desa Pantai Bahagia.
Keyword: mangrove rehabilitation, pantai bahagia village, people perception

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