β-TCP 첨가량에 따른 생분해성 PLA/β-TCP 복합체의 생체활성과 기계적 특성 평가

문희정,김설악,김동애,Moon, Hee-Jung,Kim, Seol-Ak,Kim, Dong-Ae 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.3

본 연구는 PLA에 β-TCP를 첨가한 복합체의 생체활성도와 기계적 성질을 평가하고자 한다. 클로로프롬 용액에 24 시간 교반기를 이용해서 PLA와 β-TCP를 무게별로 0, 10, 30, 50 wt% 용해한 후 에탄올 용액에서 PLA/β-TCP 복합체를 추출 후 사출성형을 통해 다양한 기계적 평가를 위한 시편을 제작하였다. SBF 인체 유사 체액에 1, 7, 30, 90 일 동안 침전하여 생체활성도를 평가하였다. 본 연구 결과 PLA/β-TCP 10-30 wt% 첨가한 실험군에서는 유의하게 강도가 증가하였으나 50 wt% 첨가한 실험군에서는 감소하였다. 결론적으로 β-TCP 30 wt% 이상 첨가하는 것은 사출성형 고분자 복합체의 기계적 특성이 개선되지 않는다. 표면 생체활성도는 90일 침전 후 표면 전체에 아파타이트 결정을 형성하였다. β-TCP는 표면특성과 기계적 성질 개선효과가 있음을 입증하였다. 향후 PLA/β-TCP 첨가량에 따른 효율성과 폭 넓은 물성 연구가 필요할 것으로 사료된다. The aim of the present study was to investigate the mechanical properties of melt-injected poly lactic acid (PLA) composites with β-tricalcium phosphate (β-TCP). The PLA mixed with calcined PLA/β-TCP powder to be contents of 0, 10, 30, 50 wt%, respectively, was dissolved in chloroform solvent under stirring for 24 h. Then the liquid mixtures were dropped into ethanol to extract solvent. After drying, the well-dispersed PLA/β-TCP composites were granulated and melt-injected to prepare specimens for various mechanical testing. PLA/β-TCP induced the precipitation of an apatite bone-mineral phase on the surface after immersion in a human simulated body fluid (SBF) for 90 days, showing in bioactivity. Mean various mechanical properties PLA/β-TCP composite were increased up to 10-30 wt% with significantly in part and composite were decreased 50 wt% of showing in mechanical properties. In conclusion, Over 30 wt% addition of β-TCP to PLA may be not advisable to improve the mechanical properties of melt-injected polymeric composites. Results indicated that β-TCP can be used considered as potential reinforcing agent for increasing mechanical properties for PLA. Therefore, it was suggest that the additional effects of β-TCP and research on a wide range of substances.

Thermal Degradation Behavior of Liquid Crystalline Thermoset Composites

문희정,조승현,Moon, Hee Jung,Cho, Seung Hyun The Korean Fiber Society 2014 한국섬유공학회지 Vol.51 No.3

Liquid crystalline thermosetting epoxy, 4,4'-diglycidyloxy-${\alpha}$-methylstilbene (DOMS) was synthesized and characterized with cross-polarized optical microscopy (POM) and differential scanning calorimetry (DSC). Carbon nanotube (CNT) or graphene reinforced DOMS composites were fabricated by melt blending with sulfanilamide (SAA) as a curing agent. To investigate the thermal degradation behavior, thermogravimetric analysis (TGA) was performed under nitrogen atmosphere in the temperature range from 30 to $1000^{\circ}C$. Activation energies for decomposition (Ed) were determined by TGA as a function of the conversion by weight loss processes.

지르코니아를 함유한 열경화성 액정 에폭시의 열분해 활성화 에너지

문희정,김경호,황보세진,조승현,Moon, Hee Jung,Kim, Kyung Ho,Hwangbo, Sejin,Cho, Seung Hyun 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.3

A liquid crystalline thermosetting epoxy 4,4'-diglycidyloxy-${\alpha}$-methylstilbene (DOMS) was synthesized using sulfanilamide as the curing agent. To heat cure the epoxy, filler contents of 0.5-5 wt% zirconia were used. Thermogravimetric analysis was performed, and the activation energy was calculated using the Kissinger and Flynn-Wall methods. The activation energy was proportional to the amount of zirconia used. As the activation energies needed for 1% and 10% decomposition were similar, the thermal decomposition was predicted to have the same mechanism.

개질한 지르코니아를 함유한 열경화성 액정 에폭시의 열분해 거동

문희정,조승현,Moon, Hee Jung,Cho, Seung Hyun 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.4

In this study, liquid crystalline thermosetting epoxy resin (LCTER) was synthesized with 4,4'-diglycidyloxy-${\alpha}$-methylstilbene and sulfanilamide as a basic resin and curing agents, respectively. Following the synthesis, the LCTER composite was fabricated using modified zirconia as a filler. To investigate the thermal behavior of the LCTER composites, a thermogravimetric analysis of the LCTER composites was recorded on temperature difference, with a filler content of 0.5-5 wt% of modified zirconia. The activation energy for the thermal decomposition was calculated using the Kissinger and Flynn-Wall methods. It was found that the activation energies of LCTER composites were proportional to the amount of modified zirconia used in the composites.

치과보철물장착자의 구강위생관리용품사용에 관한 교육 실태

문희정(Moon, Hee-Jung) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.12

본 연구는 치과보철물장착자의 구강위생관리 교육경험 실태를 파악하고자 2011년 3월부터 6월까지 서울과 경기도에 거주하고 있는 18세 이상에서 65세 미만의 성인 267명을 대상으로 설문조사를 실시하였으며, SPSS 11.5 program을 이용하여 분석한 결과 다음과 같은 결론을 얻었다. 구강위생관리용품사용에 관한 교육 실태에서 미혼자는 기혼자 보다 구강위생용품사용은 치아건강에 좋다고 인식하였고, 18-39세가 40-64세 보다 구강위생용품사용은 치아 건강에 좋고, 반드시 사용해야한다고 인식하였다. 구강위생용품사용을 사용하고 있는 경우는 사용하지 않는 경우 보 다 구강위생용품사용은 치아건강에 좋다, 반드시 사용해야 한다고 인식하였고, 보철물 닦는 방법과 구강위생용품 선 정방법에서 교육만족도가 높았다. 이상의 결과에서 치과보철물장착자의 구강위생관리용품에 대한 인식은 높았으나 교육만족도는 이보다 낮게 나타난 결과로 치과의료기관에서는 치과보철물장착자를 대상으로 한 보다 실질적인 환자 교육시스템이 운영되어야 할 것으로 생각된다. The purpose of this study was to examine the state of oral health control education experiences among dental prosthesis users. The subjects in this study were 267 adults who were aged between 18 and less than 65 and resided in Seoul and Gyeonggi Province. A survey was conducted from March to June, 2011, and the statistical package SPSS 11.5 was employed to analyze the collected data. The findings of the study were as follows: As for the state of education on the use of oral hygiene supplies, The unmarried respondents considered the use of oral hygiene supplies to be more conducive to oral health than the married ones. The respondents aged between 18 and 39 considered the use of dental hygiene supplies to be more beneficial to oral health than those aged between 40 and 64, and the former deemed it more absolutely necessary to use oral hygiene supplies than the latter). Those who used oral hygiene supplies viewed the use of oral hygiene supplies as more conducive to oral health and considered it more absolutely necessary to use oral hygiene supplies. The respondents expressed higher satisfaction with education on how to wash prosthesis and how to choose oral hygiene supplies. The above-mentioned findings illustrated that the dental prosthesis users were well aware of oral hygiene supplies, and that their satisfaction level with related education was not high in comparison with their awareness of oral hygiene supplies. Therefore dental institutions should provide more authentic education for dental prosthesis users.

T형 연결판으로 전면블록과 보강재를 연결하여 시공하는 보강토 옹벽 공법

문희정(Moon, Hee-Jung) 한국지반신소재학회 2015 한국토목섬유학회 학술발표회 Vol.2015 No.10

치과위생사의 근무분야별 근무환경에 관한 연구

문희정 ( Hee Jung Moon ),장미화 ( Mi Hwa Jang ),신명숙 ( Myung Suk Shin ) 한국치위생과학회 2007 치위생과학회지 Vol.7 No.1

β-TCP 첨가량에 따른 생분해성 PLA/β-TCP 복합체의 생체활성과 기계적 특성 평가

문희정(Hee-Jung Moon),김설악(Seol-Ak Kim),김동애(Dong-Ae Kim) 한국콘텐츠학회 2021 한국콘텐츠학회논문지 Vol.21 No.3

본 연구는 PLA에 β-TCP를 첨가한 복합체의 생체활성도와 기계적 성질을 평가하고자 한다. 클로로프롬 용액에 24 시간 교반기를 이용해서 PLA와 β-TCP를 무게별로 0, 10, 30, 50 wt% 용해한 후 에탄올 용액에서 PLA/β-TCP 복합체를 추출 후 사출성형을 통해 다양한 기계적 평가를 위한 시편을 제작하였다. SBF 인체유사 체액에 1, 7, 30, 90 일 동안 침전하여 생체활성도를 평가하였다. 본 연구 결과 PLA/β-TCP 10-30 wt% 첨가한 실험군에서는 유의하게 강도가 증가하였으나 50 wt% 첨가한 실험군에서는 감소하였다. 결론적으로 β-TCP 30 wt% 이상 첨가하는 것은 사출성형 고분자 복합체의 기계적 특성이 개선되지 않는다. 표면 생체활성도는 90일 침전 후 표면 전체에 아파타이트 결정을 형성하였다. β-TCP는 표면특성과 기계적 성질 개선효과가 있음을 입증하였다. 향후 PLA/β-TCP 첨가량에 따른 효율성과 폭 넓은 물성 연구가 필요할 것으로 사료된다. The aim of the present study was to investigate the mechanical properties of melt-injected poly lactic acid (PLA) composites with β-tricalcium phosphate (β-TCP). The PLA mixed with calcined PLA/β-TCP powder to be contents of 0, 10, 30, 50 wt%, respectively, was dissolved in chloroform solvent under stirring for 24 h. Then the liquid mixtures were dropped into ethanol to extract solvent. After drying, the well-dispersed PLA/β-TCP composites were granulated and melt-injected to prepare specimens for various mechanical testing. PLA/β-TCP induced the precipitation of an apatite bone-mineral phase on the surface after immersion in a human simulated body fluid (SBF) for 90 days, showing in bioactivity. Mean various mechanical properties PLA/β-TCP composite were increased up to 10-30 wt% with significantly in part and composite were decreased 50 wt% of showing in mechanical properties. In conclusion, Over 30 wt% addition of β-TCP to PLA may be not advisable to improve the mechanical properties of melt-injected polymeric composites. Results indicated that β-TCP can be used considered as potential reinforcing agent for increasing mechanical properties for PLA. Therefore, it was suggest that the additional effects of β-TCP and research on a wide range of substances.

3D 컴퓨터그래픽스에서의 카툰렌더링에 관한 연구

문희정(Moon, Hee Jung) 한국디자인지식학회 2007 디자인지식저널 Vol.5 No.-

3D에서 표현 기법에 관한 연구는 많이 되고 있다. 이 중에서도 최근 애니메이션이나 게임 등에서 눈에 띄게 볼 수 있는 것이 2D느낌이 나는 3D컴퓨터그래픽스의 표현이다. 이것을 비사실적 렌더링(NON-PHOTOREALISTIC RENDERING) 이라고 한다. 3D컴퓨터그래픽스는 렌더링 방식에 따라 사실성을 추구하는 포토리얼리틱 렌더링(PHOTOREALISTIC RENDERING)과 사람의 손으로 그린 듯 한 느낌의 비사실적 렌더링(NON-PHOTOREALISTIC RENDERING)으로 구분된다. 최근에는 다양한 기법의 비사실적 렌더링 (NON-PHOTOREALISTIC RENDERING)이 다양한 분야에 사용되면서 그 영역이 확대되고 있다. 따라서 향후에도 많은 연구가 이루어질 것으로 예상되며, 그 응용범위도 매우 확대 될 것으로 생각된다. 본 연구에서는, 3D컴퓨터 그래픽스 기법 중 배사실적 이미지 기법(Non-photo Rendering)의 범주에 속하는 카툰렌더링(Cart∞n Rendering)기법을 분석하고 카툰렌더링(Cartoon Rendering)에 대한 표현을 제시하고자 한다. There are a lot of studies for expression technique in 3D. And now here is the expression of 3D graphics with 2D feeling on recent animation and game. It was called “non-photorealistic rendering”. The 3D graphics are divided by rendering method, one is photorealistic rendering which pursue reality and the other is non-photorealistic rendering which is hand writing feeling. The non-photorealistic rendering have a purpose to make a picture with hand writing feeling for making the picture of human friendly. Nowadays, the field of non-photorealistic rendering techniques are being expanded so these techniques are applied various other fields. So it was expected lots of studies will be performed and applicable fields are also expanded dramatically. In this study, it is analyzed the method of cartoon rendering about non-photorealistic rendering of 3D computer graphic technique and presents the expression of cartoon rendering.

[건축신기술소개] T형 연결판으로 전면블록과 보강재를 연결하여 시공하는 보강토 옹벽 공법(신기술 775호)

문희정(Moon, Hee-Jung),성낙전(Sung, Nak-Jeon) 대한건축학회 2015 建築 Vol.59 No.11