Solution‐processed polar hydroxyl containing polymers such as poly(4‐vinylphenol) are widely utilized in organic filed‐effect transistors (OFETs) due to their high dielectric constant (k) and excellent insulating properties owing to the crosslinking through their hydroxyl groups. However, hydroxyl functionalities can function as trapsites, and their crosslinking reactions decrease the k value of materials. Hence, in this study, new solution‐processable copolymers containing both carboxyl and hydrophobic functionalities are synthesized. A fluorophenyl azide (FPA) based UV‐assisted crosslinker is also employed to promote the movement of polar carboxyl groups toward the bulk region and the hydrophobic functionalities to the surface region, thereby maintaining the high‐k characteristics and hydrophobic surface in thin film. Thus, the addition of an FPA crosslinker eliminates the trapsites on the surface, allowing a stable operation and efficient charge transport. Additionally, the solution‐processability enables the production of uniform and thin films to yield OFETs with stable and low‐voltage driving characteristics. The printed layers are also applied as gate dielectrics for floating gate memory devices and in integrated one‐transistor‐one‐transistor based memory cells, displaying their excellent memory performance. The synthesis and fabrication strategies employed in this study can become useful guidelines for the production of high‐k dielectrics for stable OFETs and other applications.
This study aims to derive the policy measures to effectively conserve and sustainable use the Baekdudaegan in National Parks through the literature review on policy trends, public awareness survey, on-site survey, and so on. As a trend of public concern, From 1991 to 2019, there were a total of 38,358 articles mentioning Baekdudaegan, and 1,413 articles( 4%) mentioning Jongju(successive climbing) together. In terms of search volume, the volume for Baekdudaegan and Jongju has decreased relatively since 2010. The annual number of visitors including the closed section was estimated to be 400. The public awareness survey showed that the awareness of Baekdudaegan was 73.5%, while the awareness of Baekdudaegan Mountains Reserve was 42%. 69.1% have visited Baekdudaegan, however, only 15.7% aim for Jongju(successive climbing). 24.8% of the respondents are willing to visit Baekdudaegan for Jongju(successive climbing) in the future. As a result of evaluating the conservation and safety of the Baekdudaegan Closed Section, all 11 sections of the park have excellent conservation values overall, and there are many dangerous areas in terms of safety. Based on the results of this study, 4 policies were suggested; ①to promote the transition of the “Baekdudaegan Visitation Culture”, ②to strengthen the means of conservation of the Baekdudaegan Closed Section in the National Park, ③to sketch a pilot project to derive “effective management directions of ridge trail” ④to strengthen the legal basis for effective access control of the closed section.
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