Judul: Community Perception and Participation in the Development and Management of the Sipinsur Geosite Area Before and During the Pandemic
Abstrak: Objek wisata Sipinsur termasuk dalam KSPN Danau Toba. Penelitian ini menganalisis persepsi dan partisipasi masyarakat serta dampak ekonomi dan sosial terhadap pengembangan Geosite Sipinsur sebelum dan selama pandemi. Metodenya adalah analisis dengan skala likert dan analisis SWOT. Hasil penelitian yaitu persepsi masyarakat terhadap pengembangan aktivitas sebelum dan selama pandemi sangat tinggi yaitu 95,40% dan 86,52%. Sarana dan prasarana sebelum dan selama pandemi juga sangat tinggi yaitu 83,96% dan 80,81% serta kegiatan promosi dan pelayanan sebelum dan selama pandemi tinggi yaitu 71,05% dan sangat tinggi 82,59%. Partisipasi masyarakat sebelum pandemi tinggi yaitu 77,34% sedangkan selama pandemi sedang dengan persentase 59,43%. Dampak positif meliputi pendidikan, interaksi sosial, kesempatan kerja, dan pendapatan. Dampak negatif mencakup perubahan sosial, pencemaran lingkungan, dan keamanan. Strategi pengembangan Geosite Sipinsur pada kuadran I, menunjukkan posisi growth-oriented strategy., The Sipinsur tourist attraction is included in the Lake Toba KSPN. This research analyzes community perception and participation as well as the economic and social impacts of the development of the Sipinsur Geosite before and during the pandemic. The method is analysis with a likert scale and SWOT analysis. The research results show that public perception of activity development before and during the pandemic is very high, namely 95,40% and 86,52%. Facilities and infrastructure before and during the pandemic were also very high, namely 83,96% and 80,81%, and promotional activities and services before and during the pandemic were high, namely 71,05% and very high 82,59%. Community participation before the pandemic was high, namely 77,4%, while during the pandemic it was moderate with a percentage of 59,43%. Positive impacts include education, social interaction, employment opportunities, and income. Negative impacts include social change, environmental pollution, and security. The development strategy places the Sipinsur Geosite in quadrant I, indicating a growth-oriented strategy.
Keyword: partisipasi, Persepsi, Strategi, participation, perception, Strategy, Pandemi, Skala likert, Likert scale, pandemic

Judul: Community Resilience Around Nature Tourism Situ Gunung in the Era of COVID-19 Pandemic
Abstrak: Pandemi COVID-19 telah menyebabkan kerugian pada sektor pariwisata dan masyarakat sekitarnya, termasuk masyarakat sekitar kawasan wisata alam Situ Gunung. Adaptasi diperlukan masyarakat untuk mencapai resiliensi. Penelitian ini bertujuan untuk menganalisis persepsi masyarakat terhadap dampak, strategi adaptasi dan strategi mitigasinya dalam situasi pandemi COVID-19. Metode yang digunakan adalah survei rumah tangga dengan menggunakan kuesioner dan wawancara berdasarkan metode penentuan sampel dengan tabel Isaac dan Michael pada tingkat kesalahan 10%. Hasil penelitian menunjukkan bahwa pandemi COVID-19 telah berdampak ekonomi pada kehidupan masyarakat namun tidak menimbulkan dampak sosial. Kapasitas adaptasi masyarakat masih rendah, strategi adaptasi dilakukan oleh masyarakat dengan kondisi perekonomian rentan berdasarkan karakteristik pekerjaannya. Strategi mitigasi sudah dimiliki masyarakat namun masih dalam inisiatif di tingkat rumah tangga, The COVID-19 pandemic has caused losses to the tourism sector and surrounding communities, including the communities around the Situ Gunung natural tourism area. Adaptation is necessary for society to achieve resilience. This study aims to analyze people's perception of the impact, adaptation strategy, and mitigation strategy in the situation of the COVID-19 pandemic. The method used is a household survey using questionnaires and interviews based on the determining samples method with Isaac and Michael tables at a 10% error rate. The results showed that the COVID-19 pandemic has had a negative economic impact on people's lives but has no negative social impact. The adaptation capacity of the community is still low, the adaptation strategy is carried out by people with vulnerable economic conditions based on the characteristics of their job. The community, particularly at a household level, already has mitigation strategies.
Keyword: community, covid-19, resilience, tourism

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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