Judul: Kajian Ekonomi Pelestarian Penyu Sebagai Obyek Wisata Berbasis Jasa Lingkungan (Studi Kasus Turtle Conservation and Education Center (TCEC) Pulau Serangan, Bali)
Abstrak: Turtle conservation is important activity for sustaining turtle resources. Turtle Conservation and Education Center (TCEC) in Pulau Serangan, Bali, which plays a significant role in conservation of turtle. TCEC has the potential for tourism activities, whereas the economic assessment is required for their sustainability. Research objectives of this study were to assess the turtle resource management system in TCEC, to identify the characteristics of turtle conservation in TCEC, to analyze the economic value of ecotourism in TCEC and to assess feasibility of the development of TCEC. The research method that used was survey. This research used data analysis method, that were (1) descriptive analysis, which used to assess the management system on turtle resources and to identify the characteristics of tourists, (2) Travel Cost Method (TCM), (3) Contingent Valuation Method (CVM), and (4) Cost Benefit Analysis (CBA). The result showed that were some differences in the characteristics of foreign and domestic tourists respondents viewed from age, educational background, income level, number of dependents and the frequency of their visits. TCEC has a high economic value, amounting to Rp 518.656.568.627. WTP values of domestics tourists respondents was Rp 10.661,76 per visit and the value of foreign tourists respondents was reach to Rp 55.333,33 per visit. Feasibility analysis of TCEC during 2008-2013 showed that financial sustainability of turtle conservation is limited, therefore the financial management of TCEC needs to be improved. Analysis of TCEC development plan from 2014-2023 indicated that TCEC will be feasible based on some criteria such as NPV> 0, Net B / C ≥ 1 and IRR ≥ discount rate. TCEC activities in turtle conservation is important for sustainability of turtle resource
Keyword: Ecotourism, Travel Cost Method, Contingent Valuation Method, Cost Benefit Analysis, Turtle conservation

Judul: Utilisation Management and Perception of  Community and Visitors in Turtle Conservation in Karimunjawa National Park
Abstrak: Karimunjawa merupakan habitat penyu sisik dan penyu hijau sebagai satwa yang dinyatakan hampir punah. Penelitian bertujuan mengidentifikasi dan mendeskripsikan manajemen pemanfaatan, persepsi, serta menganalisis kesediaan membayar masyarakat dan pengunjung dalam mendukung konservasi penyu hijau dan penyu sisik. Data dikumpulkan dengan metode observasi lapang, wawancara, dan pengisian kuesioner. Hasil penelitian menunjukkan bahwa bentuk manajemen pemanfaatan penyu di TNKJ adalah melalui program Penetasan Semi Alami (PSA) Penyu, yakni penetasan telur dan pemeliharaan untuk dilepasliarkan guna menjaga kelestarian penyu di alam, serta penunjang ilmu pengetahuan dan teknologi konservasi, pendidikan, penelitian dan wisata. Terdapat empat kategori responden yang diwawancarai, yakni 1) masyarakat nelayan, 2) masyarakat non-nelayan, 3) pengunjung PSA, dan 4) pengunjung non-PSA yang secara keseluruhan memiliki persepsi positif dengan kategori sangat baik terkait konservasi, pemanfaatan, dan upaya pelestarian penyu melalui program PSA di TNKJ serta memiliki nilai rata rata Willingness to Pay (WTP) dalam mendukung konservasi penyu sebesar Rp 14.924., Karimunjawa is the habitat of hawksbill and green turtles, which are endangered species. The study aims to identify and describe the use management, perception, and analyse the willingness to pay of the community and visitors in supporting the conservation of green and hawksbill turtles. Data were collected using field observation, interviews, and questionnaires. The results showed that the management of sea turtle utilisation in TNKJ is through the Turtle Semi-Natural Hatchery (PSA) programme, which is the hatching of eggs and rearing for release to preserve sea turtles in nature, as well as supporting science and technology conservation, education, research and tourism. There are four categories of respondents interviewed, namely 1) fishing communities, 2) non-fishing communities, 3) PSA visitors, and 4) non-PSA visitors who overall have positive perceptions with very good categories related to sea turtle conservation, utilisation, and conservation efforts through the PSA programme in TNKJ and have an average Willingness to Pay (WTP) value in supporting sea turtle conservation of Rp 14.924.
Keyword: Karimunjawa, Kesediaan membayar, Pemanfaatan, Penyu, Persepsi

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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