Judul: Sebaran Terumbu Karang di Perairan Pulau Menjangan Taman Nasional Bali Barat dan Biorock Pemuteran, Bali
Abstrak: Penelitian ini bertujuan mengetahui sebaran genus karang keras, bentuk pertumbuhan (lifeform) karang keras, komposisi komunitas bentik serta persentase tutupan karang keras di perairan Pulau Menjangan dan Biorock Pemuteran, Bali. Pengambilan data dilakukan pada bulan Juni 2016 menggunakan metode Point Intercept Transect (PIT) dengan panjang setiap transeknya 50 meter dan dilakukan sebanyak tiga kali pengulangan yang dibentangkan sejajar garis pantai. Komposisi komunitas bentik di kedua lokasi penelitian didominasi oleh dead coral with algae (Perairan Pulau Menjangan 51%, Biorock Pemuteran 48.9%). Diikuti oleh persentase abiotic (18%), hard coral (16%), soft coral (10%), dead coral (4.5%) dan other fauna (0.5%) di perairan Pulau Menjangan. Sedangkan di Biorock Pemuteran persentase abiotic (35%), hard coral (12%), dead coral (4%) dan other fauna (0.1%). Alveopora dan Stylophora merupakan genus karang keras yang paling dominan ditemukan di perairan Pulau Menjangan, sedangkan Acropora dan Porites dominan di Biorock Pemuteran. Coral branching dan Coral massive merupakan lifeform karang yang mendominasi kedua lokasi penelitian., This study aims to determine the distribution of hard coral genus, hard coral lifeform, benthic community composition and the percentage of hard coral cover in the waters of Menjangan Island and Biorock Pemuteran, Bali. Data collection was carried out in June 2016 using the Point Intercept Transect (PIT) method with a length of each transect of 50 meters and carried out three repetitions spread parallel to the shoreline. The composition of benthic communities in both study sites was dominated by dead coral with algae (Menjangan Island waters 51%, Biorock Pemuteran 48.9%). Followed by abiotic percentages (18%), hard coral (16%), soft coral (10%), dead coral (4.5%) and other fauna (0.5%) in the waters of Menjangan Island. Meanwhile in Biorock Pemuteran the percentage of abiotic (35%), hard coral (12%), dead coral (4%) and other fauna (0.1%). Alveopora and Stylophora are the dominant hard coral genus found in Menjangan Island waters, while Acropora and Porites are dominant in Biorock Pemuteran. Coral branching and Coral massive are coral lifeforms that dominate both study sites.
Keyword: benthic, biorock, hard coral genus, lifeform, Menjangan

Judul: : Struktur Komunitas Ikan Karang pada Ekosistem Terumbu Karang di Pulau Menjangan, Taman Nasional Bali Barat
Abstrak: Terumbu karang merupakan ekosistem yang banyak ditemukan di pulaupulau kecil di wilayah tropis, termasuk di Pulau Menjangan. Penelitian ini bertujuan untuk melihat kondisi ekosistem terumbu dan struktur komunitas ikan karang serta hubungan antara kelimpahan ikan karang dan bentuk pertumbuhan karang keras di Pulau Menjangan Taman Nasional Bali Barat. Pengambilan data ikan dilakukan dengan metode Underwater Visual Cencus dan pengambilan data terumbu karang menggunakan metode Point Intercept Transect. Persentase tutupan karang hidup termasuk ke dalam kategori sedang hingga baik sekali. Ditemukan total 10 bentuk pertumbuhan karang keras, 25 famili, 59 genus, 105 spesies dan 3104 individu ikan. Jenis-jenis ikan karang yang teridentifikasi dari hasil pengamatan dibedakan menjadi tiga kelompok yaitu ikan indikator, ikan mayor, dan ikan target. Kelompok ikan mayor paling banyak ditemukan di keempat Stasiun pengamatan. Nilai indeks keanekaragaman, keseragaman dan dominansi menunjukkan kondisi komunitas ikan karang di Pulau Menjangan berada dalam kondisi yang cukup baik atau stabil. Hasil visualisasi keterkaitan antara famili ikan karang dengan pertumbuhan karang keras berupa biplot dari analisis memberikan keragaman informasi sebesar 79,92% dari keseluruhan data yang didapat., Coral reefs are ecosystems commonly found on small islands in tropical regions, including Menjangan Island. This research aims to examine the condition of the reef ecosystem and the structure of coral fish communities, as well as the relationship between the abundance of coral fish and hard coral lifeform in Menjangan Island, West Bali National Park. Fish data collection was carried out using the Underwater Visual Census method, and coral reef data were collected using the Point Intercept Transect method. The percentage of live coral cover falls into the categories of fairly to very good. A total of 10 forms of hard coral growth, 25 families, 59 genera, 105 species, and 3104 individual fish were found. Coral fish species identified from observations were categorized into three groups: indicator fish, major fish, and target fish. The major fish group was most commonly found in all four observation stations. Diversity index, evenness, and dominance values indicate that the coral fish community at Menjangan Island is in fairly good or stable condition. The visualization results of the relationship between coral fish families and hard coral growth in the form of a biplot from the analysis provide 79.92% information diversity from the overall data obtained.
Keyword: terumbu karang, ikan karang, komunitas bentik, karang keras

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.
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