아마(Linum usitatissimum L.) 하배축의 생장과 cellulose 및 lignin 합성에 미치는 에틸렌과 자스몬산의 효과

민진규 건국대학교 대학원 2011 국내석사

아마(Lunum usitatissimum L.)의 하배축을 대상으로 종자 발아 후 하배축의 생장 변화와 toulidine blue 염색을 이용한 하배축 내부의 형태의 변화를 조사하였다. 종자 발아 후 3일째에는 하배축은 빠르게 생장하고, 목부가 발달하기 시작하였고, 발아 후 6일째에는 하배축의 생장은 둔화되지만, 사부가 발달하기 시작한다는 사실을 확인하였다. 이러한 두 발생시기에 하배축 생장을 조절하는 에틸렌(ethylene)과 자스몬산(jasmonic acid)이 아마의 하배축에 미치는 효과들을 조사하였다. 특별히, 이들 생장조절자들에 의하여 목부와 사부를 중심으로 세포벽 구성성분인 리그닌과 셀룰로오스의 함량이 어떻게 변화하는지를 조사하였다. 3일째 하배축에서는 1-aminocyclopropane-1-cargoxylic acid(ACC)에 의하여 유도되는 에틸렌에 의해서 삼중반응(triple respnse)이 일어났으며, 이러한 에틸렌의 생자 억제 효과에 JA는 영향을 미치지 않았다. 또한, 두 생장 조절물질 모두 phloroglucinol 염색을 이용하여 확인한 리그닌 생성과 congo red를이용하여 확인한 셀룰로오스 생성에 어떠한 영향도 미치지 않았다. 반면에, 6일째 하배축에서는 에틸렌에 의한 생장억제 효과가 JA에 의의하여 완화되었다. 이 시기에서는, 에틸렌에 의해서는 리그닌과 셀룰로오스의 생성이 영향을 받지 않았지만, JA에 의해서는 셀룰로오스의 생성이 증가하였다. The growth stage of flax (Linum usitatissimum L.) hypocotyl was defined and the internal morphology was observed using toluidine blue staining on hypocotyls. Rapid elongation of hypocotyls and differen tiation of xylem were visible in 3-day-old flax. In 6-day-old flax, the elongation rate was reduced, but differentiation of a sieve element was initiated. We studied the effect of ethylene and jasmonic acid (JA) that regulate the growth of hypocotyls on 3-day-old and 6-day-old flax. Especially, the effect of these growth regulators on the contents of lignin and cellulose, components of cell walls, was examined on the xylem and sieve elements. In 3-day-old flax, 1-aminocyclopropane-1- carboxylic acid (ACC)-induced ethylene caused a triple response, and JA did not significantly affect ethylene-induced growth inhibition. Ethylene and JA have no effect on lignin and cellulose biosynthesis observed using phloroglucinol and congo red staining respectively. On the other hand, JA reduces ethylene-induced inhibition of hypocotyl elongation in 6-day-old flax hypocotyls. In this stage, ethylene did not affect lignin and cellulose biosynthesis. However, JA increased the cellulose content.

시민참여 기반 지역 체감더위 예상지도 구축 및 더위 개선 정책 제안 : 기계학습 분석 기법을 활용하여

민진규 경북대학교 대학원 2023 국내석사

Various environmental damages have occurred due to the indiscriminate expansion of urban space during the urbanization process, and in particular, the urban heat island and heat wave damage have also increased. For efficient and economical thermal environment response, it is necessary to select vulnerable areas of the thermal environment and prioritize response strategies, and various models such as VESTAP and MOTIVE are used to evaluate the thermal environment. However, these models have limitations in that their resolution is not detailed enough for practical use such as selecting actual project sites. Therefore, basic data that can evaluate the thermal environment of a wide area at a detailed resolution is needed. So this study aims to build a model that can predict and evaluate personal thermal sensation(PTS) as an urban environmental factor by perceiving PTS to supplement this. To collect PTS information, a living lab program, a citizen participation methodology, was operated, and the main activity of the program was operated in the form of ‘community mapping’ where citizens directly enter information on the map. An application that helps collect PTS was used for convenient information collection. Information was collected through community mapping targeting Daegu Metropolitan City, and a total of 8,120 pieces of information were collected. Urban environmental element data around each collected information location was also constructed through GIS. In addition, meteorological data at the time when each PTS information was entered was also constructed. Subsequently, a model capable of predicting PTS through urban environment and weather information was constructed using the random forest method, one of the machine learning techniques, and the accuracy of the model was 62%. Urban environmental information for the entire area of Daegu was constructed to apply to the PTS prediction model. The PTS prediction map of Daegu was created by inputting this information into the PTS prediction model. As a result of the analysis, the central business district of Daegu, Jung-gu, and adjacent areas showed a tendency for PTS to rise from the morning hours, and many areas except for the outer forests were evaluated as having high PTS from noon to evening. Throughout all time periods, PTS was evaluated as comfortable mainly in the outer forests of the city, and in urban areas, areas with many urban parks or urban forests, surrounding forests on high terrain, and areas with low sky exposure due to high buildings were evaluated as comfortable. To utilize the constructed PTS prediction map, first, comfortable and vulnerable areas of PTS in Daegu were analyzed and extracted, and it was confirmed that there was a high correlation between the two data by comparing them with the meteorological and urban environmental information by district. Based on the data of comfortable and vulnerable areas of Daegu, directions for Daegu’s heat environment improvement policy were suggested. Based on data such as Daegu’s urban basic plan, use zones, and climate change adaptation measures, areas where development should be restricted in Daegu for heat environment improvement, areas where policies for heat environment improvement should be applied as a priority, and vulnerable areas where heat environment should be improved from the perspective of climate change adaptation projects currently underway in Daegu were suggested. Through this study, a model was constructed to predict PTS using urban environmental factors, and a PTS map was created to evaluate the heat environment of a wide area in detail. In addition, comfortable and vulnerable areas of PTS in Daegu were derived using the PTS map, and directions for Daegu Metropolitan City‘s heat environment improvement policy were suggested. The detailed resolution of the PTS map is expected to be useful when implementing strategies and projects for actual heat environment improvement. It is also expected that by continuously operating living labs and community mapping to build big data, the performance and accuracy of the prediction model can be improved.

The Effect of NCO Contents in Polyurethane Foam Formulations

민진규 부산대학교 대학원 2021 국내석사

Thermoplastic polyurethanes (TPUs) as automotive panels with high heat stability and durability have been newly developed through the synthetic process by reacting polyester polyol (BTG), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), and triol-polycaprolactone based on the different NCO/OH ratio (NCO index). The tensile strength and heat resistance of TPUs depended on the NCO index in the formulation. To produce polyurethane foam with suitably rigidity and uniform skin pores, the optimal synthetic process was controlled precisely by the amount of solvent, foaming agent, silicone surfactant, and catalysts contents. A considerable NCO index dependence was observed for the range of 0.96 ≤ NCO index ≤ 0.99 at a fixed 30,000 molecular weight, it was confirmed that it has high thermal, mechanical properties and the uniform cell structure of molding foam at NCO index of 0.98. It relates to TPU skin materials for powder slush molding (PSM) using triol-polycaprolactone chain extender and included the raw material composition and the synthesizing process. The multifunctional crosslinking agent formed an interpenetrating polymer network during the foaming process to increase the hardness. In these results indicated that TPU foam has potential applications in materials of soft or semi-rigid polyurethane foam. NCO/OH 비율(NCO Index)을 기반으로 polyester polyol (BTG), polycaprolactone triol (PCL), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 1,4-butanediolbutanediol을 반응시켜, 합성 공정을 통해 열 안정성과 내구성이 높은 열가소성 폴리우레탄 (TPU)을 새롭게 합성하였다. TPUTPU의 인장 강도와 내열성은 NCO 함량에 따라 달라졌다. 최적의 합성 공정은 용매, 발포제, 실리콘 계면 활성제 및 촉매 함량에 따라 적절한 경도와 균일한 공극을 가진 폴리우레탄 폼을 생산하기 위해 정밀하게 제어되었다. 분자량 30,000 내외, 0.96 ≤ NCO index ≤ 0.99 범위에서 NCO 함량의 영향이 관찰되었으며, NCO 함량 0.98에서 성형 발포체가 높은 열적, 기계적 특성 및 균일한 셀 구조를 가지고 있음을 확인할 수 있었다. PCL을 사슬 연장제로 이용하고 powder slush molding (PSM) 공법을 통해 TPU 스킨 소재를 개발한 것으로, 원료 조성 및 합성 공정이 포함되어 있다. 다기능 가교제는 경도를 높이기 위해 발포 공정 동안 interpenetrating polymer network(IPN)를 형성했다. 이를 통해 TPU 폼은 연질 또는 반경질 폴리우레탄 폼 소재에 잠재적인 응용 분야가 있음을 확인하였다.

GFT 저작도구 설계 및 구현

민 진규 경남대학교 산업대학원 1994 국내석사