Judul: Pemulihan Vegetasi di bawah Tegakan Tua Tengkawang Pelekpek (Shorea mecistopteryx) di KHDTK Haurbentes, Kabupaten Bogor
Abstrak: Luas kawasan hutan di Indonesia mengalami penurunan setiap tahunnya yang diakibatkan oleh laju deforestasi yang selalu meningkat. Hutan dataran rendah di Indonesia didominasi oleh jenis-jenis pohon dari kelompok dipterokarpa yang bernilai komersil tinggi. Salah satu jenis meranti endemik yang berasal dari Pulau Kalimantan adalah Shorea mecistopteryx. Penelitian ini bertujuan menganalisis struktur tegakan, regenerasi alami dan produktivitas dari tegakan S. mecistopteryx. Hasil analisis menunjukkan struktur tegakan S. mecistopteryx yang berumur 83 tahun telah membentuk huruf “J” terbalik, sedangkan struktur tegakan pada umur 32 tahun berbentuk kurva normal. Potensi tegakan S. mecistopteryx pada umur 83 tahun telah menghasilkan potensi tegakan berdiameter 50 cm ke atas sebesar 323,08 m3 /ha dan kelas diameter 40 cm ke atas sebesar 541,78 m3 /ha. Potensi tegakan S. mecistopteryx pada umur 32 tahun telah menghasilkan potensi tegakan untuk kelas diameter 50 cm ke atas sebesar 45,98 m3 /ha dan kelas diamaeter 40 cm ke atas sebesar 497,73 m3 /ha.
Keyword: Shorea mecistopteryx, forest plantation, stand structure, stand volume, natural regeneration

Judul: Pemulihan Vegetasi di Areal Hutan yang Dikelola dengan Sistem TPTJ (Studi Kasus di Areal IUPHHK-HA PT. Suka Jaya Makmur, Kalimantan Barat)
Abstrak: Massive utilization of forest resources became one factor which caused degradation on natural forest. Forest degradation which occurred continuously could cause a change in forest composition. This could happen because seedling from invasive species dominated the area of natural forest. This research aimed to determine the composition and structure recovery of forest stands managed by TPTJ system on area of IUPHHK-HA PT. Suka Jaya Makmur, West Kalimantan. The results showed that non-commercial Dipterocarp species group had the biggest value of density and proportion among all levels Dipterocarp. Curve diameter distribution showed a balanced logged forest. The diversity in all plotarea was high. Kelampai and meranti were dominated in canopy level. Jambu monyet and kelampai were the species that dominated in seedling level. Tree and seedling had a different composition, it was shown by the ID value at >50%. This was shown by cluster analysis which divided into four groups. Commercial species proportion was generally larger than other non-commercial species.
Keyword: selective cutting and line planting, vegetation recovery, forest 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.
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