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: Mangrove Utilization and Mangrove Health at Pari Island, Kepulauan  Seribu
Abstrak: Pemanfaatan suatu ekosistem secara tidak bijaksana dapat menimbulkan ancaman terhadap kelanjutan ekosistem itu sendiri. Tujuan dari penelitian ini adalah mengkaji pemanfaatan mangrove, dampak dan indeks kesehatan mangrove Pulau Pari, Kepulauan seribu. Penelitian ini dilaksanakan pada bulan Juni hingga Agustus tahun 2021 pada dua lokasi yaitu kawasan mangrove yang berada di lingkungan Lembaga Ilmu Pengetahuan Indonesia (LIPI), sekarang diganti menjadi BRIN (Badan Riset dan Inovasi Nasional), dengan kawasan mangrove yang berada di lingkungan wisata Pantai Perawan. Analisis yang dilakukan adalah kondisi ekologis mangrove berdasarkan sejarah pemanfaatan mangrove dan Indeks kesehatan mangrove berdasarkan hasil wawancara dan pengamatan langsung. Mangrove di Pulau Pari pertama kali dimanfaatkan baik secara langsung ataupun tidak langsung oleh masyarakat. Ekosistem mangrove saat ini dimanfaatkan sebagai penyedia bibit mangrove, penyedia sumber daya perikanan, dan objek wisata. Indeks kesehatan mangrove pada kedua stasiun masuk dalam kategori buruk. Terdapat dua jenis mangrove yang ditemukan yaitu jenis Rhizophora stylosa dan Rhizophora apiculata dengan kerapatan yang rendah. Pemanfaatan sebagai tempat wisata berperan paling penting terhadap kerusakan mangrove, antara lain karena peningkatan sampah., Utilization of an ecosystem unwisely can pose a threat to the continuation of the ecosystem itself. This study aimed to examine the use of mangroves, the impact and the health index of mangroves in Pari Island, Thousand Islands. This research was carried out from June to August 2021 comparing two sites, namely the mangrove area in the LIPI, now changed to BRIN, environment and the mangrove area in the tourist area of Perawan Beach. The analysis carried out is the ecological condition of mangroves based on the history of mangrove utilization and the mangrove health index based on the results of interviews and direct observations. The community first used Mangroves on Pari Island directly or indirectly. Mangrove ecosystems are currently used as mangrove seed providers, fisheries resource providers, and tourist attractions. The mangrove health index at both stations was in the bad category. Two types of mangroves were found, namely Rhizophora stylosa and Rhizophora apiculate, with low density. Utilization as a tourist spot plays the most important role in destroying mangroves, partly due to increased waste.
Keyword: Ekosistem Mangrove, Pemanfaatan, Pulau Pari, Mangrove ecosystem, Pari Island, Utilization

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
Keyword: