Judul: Pengembangan Promosi Wisata Danau Toba di Kabupaten Samosir, Provinsi Sumatera Utara
Abstrak: Samosir Regency was established based on Act number 36/2003. Tourism is one of leading sectors for accelerating regional development (Tourism, Art and Cultural Agency of Samosir Regency 2006). Samosir Regency had a great tourism potentials, one of is Toba Lake were with it’s beautiful Island of Samosir located in the middle of the lake. The objectives of this research were to identify media promotions within the area and Samosir Regency and to measure the effectiveness of promotion. This research was expected to provide current information on tourism objects within the regency and to increase number of tourist. Research was conducted at Samosir Regency, Province of North Sumatera from July to September 2009. The location of research consisted of three subdistricts, i.e Pangururan, Sianjur Mula-Mula and Simanindo. Tourism sites that were studied were Pantai Pasir Putih Nature Tourism, Aek Rangat Nature Tourism and Tuktuk Siadong Nature Tourism, Cultural and Archaeological Tourism of Batu Sawan and Batu Hobon. The materials that were used consisted of documents, questioners, interview guide, Likert statement, recorder and digital camera. Collected data comprised of primary and secondary data. Primary data included type, technique, subject and targets of promotion. These data were collected through interview with the community, local government and NGO’s and questioners were distributed to visitors. Secondary data consisted of general condition of research location such as history, location and total area, topography, demography condition, accessibility, climate, social and culture conditions, potentials of tourism objects. The collected data were analyzed using EPIC Model and descriptive analysis. Result of the research showed that most of the promotion technique were mouth to mouth with the following results in Pantai Pasir Putih (76.67%), Aek Rangat (50%), Batu Sawan (56.67%), Batu Hobon (76.67%), and Tuktuk Siadong (66.67%). The results showed that media promotions were effective in three tourism sites i.e 2.45 for Pasir Putih, 2.51 for Aek Rangat and 2.57 for Tuktuk Siadong. The media promotions in Batu Hobon and Batu Sawan were regarded as sufficient with score of 2.17 and 2.13. The recommendations for media promotion development that can be run by local government included determining promotion target in each tourism sites, arranging effective promotion through leaflet, booklet, magazine, television, homepage and radio to raise attention, interest, desire and action from the tourists. Radio could be an effective mean of promotion for Batu Sawan since these areas are intended especially for the local community and talking into consideration the time of on air which should suit the time where most of people are listening the radio.
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Judul: Tata Kelola Ekowisata di Pulau Samosir, Kabupaten Samosir, Sumatera Utara
Abstrak: Danau Toba telah ditetapkan menjadi salah satu destinasi wisata super prioritas di Indonesia. Pulau Samosir yang berada ditengah kawasan Danau Toba sebagai objek unggulan wisata. Penelitian bertujuan untuk merumuskan tata kelola ekowisata di Pulau Samosir. Data dikumpulkan melalui observasi lapang, wawancara, dan penelusuran dokumen. Didapatkan 25 stakeholder yang teridentifikasi dan terdiri atas instansi pemerintah, Badan Usaha Milik Negara (BUMN), komunitas lokal, swasta, lembaga masyarakat serta masyarakat. Setiap stakeholder memiliki Tupoksi untuk instansi pemerintah daerah, serta aturan kelembagaan bagi yang lain. Dinas Pariwisata Kabupaten Samosir memiliki hubungan terbanyak dalam bentuk komunikasi, koordinasi dan bekerjasama dalam menjalankan program pengembangan wisata. Tata kelola ekowisata di Pulau Samosir dirumuskan berdasarkan prinsip good governance yaitu partisipasi, transparansi, akuntabilitas, efektifitas dan efisiensi, kepastian hokum serta responsif., Lake Toba has been designated as one of the super priority tourist destinations in Indonesia that requires accelerated tourism development. There is Samosir Island in the middle of the Lake Toba area which is one of the leading objects. The research aims to identify and classify stakeholders who have an interest and influence in tourism development, mapping relationships between stakeholders, and formulating ecotourism governance on Samosir Island. Data were collected through field observations, interviews, and document searches. There are 25 identified stakeholders consisting of government agencies, State-Owned Enterprises (BUMN), local communities, the private sector, community institutions and the community. The development of ecotourism on Samosir Island is supported by duties and functions, institutional rules. The Samosir Regency Tourism Office has the most relations in the form of communication, coordination and cooperation in carrying out tourism development programs. Ecotourism governance in Samosir Island is formulated based on the principles of good governance, participation, transparency, accountability, effectiveness and efficiency, legal certainty and responsiveness.
Keyword: development, governance, Samosir Island, stakeholders

Judul: Algoritme LLL dan Aplikasinya dalam Pembongkaran Sistemkripto Knapsack Merkle-Hellman
Abstrak: LLL algorithm is an algorithm that can be used to determine an approximation of the shortest vector in a lattice. Size reduction algorithm is an important step of LLL algorithm. The LLL algorithm can be applied in many elds. This paper shows how LLL algorithm can be used in breaking one of the famous cryptosystem, namely the Merkle-Hellman knapsack cryptosystem. Merkle-Hellman knapsack cryptosystem is an asymmetric cryptosystem using the subset sum problem as the support of security. Subset sum problem can be transformed into the problem of determining shortest vector in a lattice, so that LLL algorithm can also be used to solve the subset sum problem. Since the subset sum problem can be easily solved by applying LLL algorithm, then the Merkle-Hellman knapsack cryptosystem can also be easily be destructed.
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