Judul: Penilaian Ekonomi Lingkungan Terhadap Konversi Hutan Mangrove Menjadi Tambak dan Pemukiman (Studi Kasus di Hutan Angke Kapuk Jakarta Utara)
Abstrak: The conversion of the mangrove forest in Angke Kapuk done by government, private sector and the community has degraded the quality of the environment of the mangrove forest. Therefore, the purpose of this research is to 1) calculate the total economic values of the forest mangrove, and analyze the social and economic aspects of the community around the Angke Kapuk; 2) calculate and analyze the willingness to pay from the Pantai Indah Kapuk community and the willingness to accept from the community of the fish pond owners ; 3) analyze the factors which have an effect on the willingness to pay from the Pantai Indah Kapuk community and the willingness to accept from the community of the fish ponds owners. Results from the research show that the total economic value of the Angke Kapuk mangrove is Rp. 4.184.566.038,- per annum or Rp. 73.418.378,- per hectare per annum. The total economic value of the Angke Kapuk forest, which was as wide as 1154,88 hectares before it was converted by PT. Mandara Permai, was Rp. 84.789.416.385,- per annum. The amount of money willingly paid by the community of Pantai Indah Kapuk is Rp. 165.440.880,- per annum and the amount of money willingly accepted by the community of the fish pond owners is Rp. 1.329.745.043,-. The willingness to pay from the Pantai Indah Kapuk community for the improvement of the quality of the environment is affected by the people’s occupations, educations, incomes, and size of households. The amount of money willingly paid by the Pantai Indah Kapuk community is affected by their ages, educations, incomes, and size of households. The willingness to accept from the community of the fish pond owners for the improvement of the environment is affected by their educations, incomes, and size of households. The amount of money willingly accepted by the community of the fish pond owners is affected by their incomes, educations, expenditures, and size of households. The actions and efforts done to improve the environment and to manage the Angke Kapuk forest areas include: 1) the replanting of the mangrove plants; 2) the building of embankments as wave breakers; 3) the handling of plastic and household waste; and 3) the handling of illegal fish ponds within the forest areas. Keywords : total economic value of the mangrove, the willingness to pay, the willingness to accept.
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Judul: Study of Economic Value and Sustainability of Mangrove Ecosystem Management in Angke Kapuk Nature Tourism Park
Abstrak: Konversi lahan mangrove menjadi peruntukkan lain kerap kali terjadi di Indonesia, tidak terkecuali di Provinsi DKI Jakarta. Salah satu lahan mangrove yang berhasil dipertahankan sebagai lokasi ekowisata oleh Pemerintah Provinsi DKI Jakarta adalah Taman Wisata Alam (TWA) Angke Kapuk. Selain mempertahankan fungsi ekosistem mangrove sebagai penyedia jasa lingkungan, keberadaan TWA Angke Kapuk juga memiliki banyak kegunaan baik secara langsung maupun tidak langsung bagi wisatawan dan masyarakat sekitar. Penelitian ini bertujuan untuk (1) mengkaji kondisi ekosistem mangrove di TWA Angke Kapuk, (2) mengestimasi nilai ekonomi total dari ekosistem mangrove di TWA Angke Kapuk, (3) menganalisis status keberlanjutan ekosistem mangrove di TWA Angke Kapuk. Metode penelitian yang digunakan adalah studi kasus, sedangkan metode analisis yang digunakan adalah analisis deskriptif kuantitatif, valuasi ekonomi, Travel Cost Method (TCM), dan Rapid Appraisal of Mangrove Forest (Rap_Mforest). Hasil penelitian menunjukkan kondisi ekosistem mangrove TWA Angke Kapuk lebih baik setelah adanya rehabilitasi dilihat dari pertambahan luas tutupan vegetasi, jenis, kerapatan, serta perubahan pemanfaatan ekosistem mangrove. Hasil estimasi nilai ekonomi total ekosistem mangrove TWA Angke Kapuk yaitu sebesar Rp17.943.600.572/tahun atau Rp179.759.573/ha/tahun. Status keberlanjutan ekosistem mangrove TWA Angke Kapuk memiliki status kurang berkelanjutan untuk dimensi ekologi (50,23), sedangkan untuk dimensi ekonomi (64,83), dimensi sosial (56,95), dan dimensi kelembagaan (53,75) memiliki status cukup berkelanjutan. Pengelolaan TWA Angke Kapuk perlu ditingkatkan agar ekosistem mangrove dapat mencapai status keberlanjutan baik., Conversion of mangrove land into other uses often occurs in Indonesia, including in Special Capital Region of Jakarta. One of the mangrove lands that has been successfully preserved as an ecotourism area by the Jakarta Provincial Government is the Angke Kapuk Nature Tourism Park (NTP). Besides to maintain its function as an environmental service providers, the existence of Angke Kapuk NTP is also directly and indirectly useful for tourists and the surrounding community. This research aims to (1) examine the condition of mangrove ecosystem in Angke Kapuk NTP, (2) estimate the total economic value of mangrove ecosystem in Angke Kapuk NTP, and (3) analyze the sustainability status of mangrove ecosystem in Angke Kapuk NTP. The research method used in this research is case study, while the analytical methods used are quantitative descriptive analysis, economic valuation, Travel Cost Method (TCM), and Rapid Appraisal of Mangrove Forest (Rap_Mforest). The results of the research showed that the condition of mangrove ecosystem after rehabilitation is in a better condition, which can be seen from the improvement in the area of vegetation cover, type, density, and appropriate utilization of mangrove ecosystem in Angke Kapuk NTP. The total economic value of mangrove ecosystem in Angke Kapuk NTP is Rp17.943.600.572 per year or Rp179.759.573 per hectare per year. The sustainability analysis of mangrove ecosystem in Angke Kapuk NTP are classified as less sustainable for the ecological dimension (50,23), while for other dimensions which consist of the economic dimension (64,83), the social dimension (56,95), and the institutional dimension (53,75) are classified as quite sustainable. Therefore, the management of Angke Kapuk NTP needs to be improved in order to obtain a good sustainability status of the mangrove ecosystem.
Keyword: konversi lahan mangrove, Rap_Mforest, status keberlanjutan, TCM, valuasi ekonomi

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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