Judul: Ecological Condition and Ecotourism Potency at Timbulun Waterfall area, Sungai Nanam Village, Solok District, West Sumatera
Abstrak: Timbulun Waterfall area is a beautiful place with the stream current as one aquatic resource at Sungai Nanam Village. These resources have an important value for community in area, such as drinking water and tourism. However, human activities around the area, such as agriculture and tourism activities are not control will effect for degradation in Timbulun Waterfall area. Tourism is one the economic activities that increase fast. This condition causes development of other sector that gives negative effect at area, such as transportation development and home stay. Therefore, management is a must. This study was carried out to asses the resources quality condition based on variable of physic, chemical, and biochemical aquatic. Observation of environmental variable came from 3 stations during February 2013 to March 2013. The Analysis was done mainly ecological analysis in Timbulun Waterfall area and potential matrix of ecotourism area in Timbulun Waterfall. This result of study shows that Timbulun Waterfall area has ecological aquatic environmental condition is very natural and not yet disturbance and pollution from human activities. Based on ecological analysis shows that there are 11 potential of environmental component to development as object in ecotourism activities in Timbulun Waterfall area, such as waterfall height, waterfall pool, natural scenery, bird and fish existance, topography, vegetation coverage, current and water color. Potential value of ecotourism in Timbulun Waterfall area is 77.77% or has potential for ecotourism development. Development potential of ecotourism area must be based ecological condition, especially to key parameter in ecosystem, such as temperature, oxygen demand, and biochemical oxygen demand. Therefore, management and utilization potential area, especially for ecotourism activities can be continuing.
Keyword: Ecology, Ecotourism, Potency, Timbulun, Waterfall

Judul: Strategi Pengembangan Ekowisata di Jalur Tracking Negeri Suah Hingga Tongkoh.
Abstrak: Tracking path of Negeri Suah-Tongkoh has potential of ecotourism attractions. This region has long been used by nature lovers in North Sumatera for basic training. There are some activities that conducted in basic training such as tracking, rafting, tubing, camping, climbing, community service and conservation by doing tree planting along the entrance of Negeri Suah village. However, there is no development strategy in this region. The main objective of this research was to formulate strategies in developing ecotourism attraction in tracking path of Negeri Suah-Tongkoh. This study was conducted in tracking path of Negeri Suah-Tongkoh for two months from June 2011 to August 2011. This research used field observation and depth interview, including content analysis, analysis of the operational area of natural tourism objects and attractions, stakeholder analysis, and SWOT analysis. The research result showed that potential ecotourism attractions in tracking path of Negeri Suah-Tongkoh consists of: a. landscape attractions (Lau Jabi, Lau Malem, Ketaruman peak), b. plant attraction (Anoetochillus reinwardtii orchid, kantung semar, and the Coelogyne xyrekes orchids), and c. animal attraction(Cica Daun Sayap Biru (Chloropsis sp), Viper snake species, and Labi-labi (Trionyx sp)). The research result in stakeholder analysis showed that there are 11 stakeholder involved in ecotourism development in tracking path of Negeri Suah-Tongkoh consists of UPT. Tahura Bukit Barisan, the community of Negeri Suah (represented by the village head), Camat Sibolangit, tourism department of Deli Serdang district, tourism department of Tanah Karo district, as keyplayer, KPA Jerami, Forestry Department of USU as the subject, forest department of Deli Serdang district and forest department of Tanah Karo district as a context setter, and Mapala Parintal and Kompas as a crowd. The position of ecotourism development strategy in SWOT analysis situated in quadrant 1 that used SO strategy (strength opportunity). The strategy consists of a. ecological and education tourism development supported by the existence of the forest education of University of North Sumatra in Tahura Bukit Barisan, b. special interest tourism tour package that are supported by tourism department of Deli Serdang and Tanah Karo district as an effort to increase revenue from tourism sector, c. Negeri Suah village as part of special interest tourism tour package d. education and training that give to community of Negeri Suah regarding the management of ecotourism.
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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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