Synthesis and Analysis Polyimide Including Benzoxazole Monomer

권준영,이승우 한국고분자학회 2023 한국고분자학회 학술대회 연구논문 초록집 Vol.48 No.1

설명적 문헌고찰을 통한 치위생윤리 연구 동향 분석(2000-2022)

권준영,김형주,탁나연,임희정 한국콘텐츠학회 2023 한국콘텐츠학회논문지 Vol.23 No.8

본 연구는 치위생윤리 연구를 설명적 문헌고찰을 통하여 연구의 특징, 동향을 분석하고자 한다. ‘Ethics education’, ‘Ethical dilemma‘. ’Ethical type’, ‘Ethical climate’, ‘Ethical decision making’, ‘Professional Ethics’ 조합하여 2000년부터 2022년 간 치위생윤리 관련 논문은 50편이며, 이 중 22편의 논문을 최종 분석한 결과 연구 대상자는 치과위생사 8편, 치과위생사와 치위생(학)과 모두는 1편, 학생 대상 논문은 13편이었다. 연구 주제어는 윤리 역량 2편, 윤리 의식 5편, 윤리적 가치관 및 도덕적 판단 4편, 윤리적 딜레마 4편, 윤리적 성향 3편이 있었으며, 윤리적 의사결정 및 직무 행동, 윤리 풍토, 윤리적 책임감 논문은 각 1편이었다. 연도별 논문 수는 2005년 1편으로 시작하여 2010년 이후 꾸준하게 발표되었고, 2012년과 2021년에 논문 수가 증가하였다. 논문은 설문조사로 진행되었으며, 치위생윤리 관련 변수를 적절하게 평가할 수 있는 측정 도구가 전무하였다. 이에 치위생윤리 관련 도구 개발과 교육프로그램 적용에 대한 기초자료를 제공하고 향후 연구 방향을 제시하고자 한다.

Fe-based multifunctional nanoparticles with various physicochemical properties

권준영,Xiang Mao,이재범 한국물리학회 2017 Current Applied Physics Vol.17 No.8

Over the past few decades, many studies have assessed Fe-based nanoparticles because of their high earth abundance, inexpensive precursors, unique optical properties, electromagnetic nature, biocompatibility, and interactivity with cells. By controlling the composition of a composite, the morphology, size, physical properties, and related functionalities, the synthesized nanomaterials can be altered for specific applications. This review introduces several methods for synthesizing iron-based binary/ternary chalcogenides, iron-based bimetallic materials, and iron-based magnetoplasmonic materials with a range of properties. Furthermore, assembled nanostructures make it possible for us to use these building blocks for broader and customized applications depending on their controlled arrangement. This will facilitate the potential application of iron-based functional materials in spintronics, biomedicine, electronics, and catalysis.

Synthesis and Analysis of Amide-based High Heat-resistant Polyimides

권준영,이승우 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2

With the development of advanced technology, it was intended to make high-strength heat-resistant polyimide for future military power. In this study, an effort was made to make polyimide that satisfies a 95% decomposition temperature of 400 ℃ or higher and a tensile strength of 80 Mpa or higher. The structures of the resulting compounds and polyimides were analyzed by ¹H-NMR (proton nuclear magnetic resonance spectroscopy), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. Amide-type AA1 and AA2 showed thermal stability of 410~421 °C under the influence of the cyclohexyl group contained in the monomer, and sufficiently achieved over 400 ℃ when the Td was 95%. Although the mechanical properties of the amide system showed some differences depending on the type of dianhydride used together with diamine, the tensile strength was 86~87 Mpa, and the target 80 Mpa or higher was easily achieved. All of the goals set were achieved.

Synthesis and Characteristic Analysis of Polyimide, Which Contains Aliphatic Benzoxazole Monomers To Make High Heat Resistance

권준영,이승우 한국고분자학회 2022 한국고분자학회 학술대회 연구논문 초록집 Vol.47 No.1

치과위생사의 윤리적 성향이 윤리적 가치관에 미치는 영향

권준영,김형주,탁나연,임희정 한국치위생과학회 2023 대한치위생과학회지 Vol.6 No.1

Background: Dental hygienists emphasize the ethics of healthcare workers. To effectively cope with various ethical conflicts, it is necessary to establish a reasonable ethical value system. Therefore, this study intends to use basic data to develop ethics education programs and ethical value evaluation tools. Methods: We conducted a questionnaire survey targeting dental hygienists between January 1 and 15, 2023. A total of 251 people’s responses were analyzed with SPSS Win 25.0, to perform frequency, t-test, one-way ANOVA, and multiple regression analysis. Results: The idealistic propensity (3.82 points) was higher than the relativistic propensity (3.42 points), and the absolutists showed a deontological position in the partnership area and dental hygiene work relationship area(P < 0.001). Regression analysis of factors affecting ethical values revealed that idealism (β=,444, p=0.000), marital status (β=-0.123, P = 0.035), and position (β=-0.154, P = 0.009) were significantly related to ethical propensity. Conclusion: It is necessary to develop an ethics education program that considers the ethical propensity of dental hygienists and establish firm ethical values by implementing situation-oriented ethics education that can respond to many changes and conflicts.

Synthesis and Analysis of Polyimide with Increased Physical Properties Using APTMS and TEOS

권준영,이승우,이유정 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1

Most of aromatic polyimide has excellent physical properties, but it has a dark brown color making it difficult to apply to a display field requiring colorless and transparent optical properties. In this study, a transparent polyimide with good physical properties was prepared by the thermal imidization to solve this problem. To improve the physical properties, it was added TEOS or APTMS to 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA) and TFMB to create a crosslinked structure using a sol-gel process. The structure of the resulting polyimide was analyzed by fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and UTM. It was found that the tensile strength of the polyimide polymer made by adding water to 6FDA, TFMB, and APTMS increased as the content of water increased, that is, as the APTMS content decreased and the TEOS content decreased.

레이저를 이용한 결정질 실리콘 태양전지의 Double Texturing 제조 및 특성

권준영,한규민,최성진,송희은,유진수,유권종,김남수,Kwon, Jun-Young,Han, Kyu-Min,Choi, Sung-Jin,Song, Hee-Eun,Yoo, Jin-Soo,Yoo, Kwon-Jong,Kim, Nam-Soo 한국재료학회 2010 한국재료학회지 Vol.20 No.12

In this paper, double texturization of multi crystalline silicon solar cells was studied with laser and reactive ion etching (RIE). In the case of multi crystalline silicon wafers, chemical etching has problems in producing a uniform surface texture. Thus various etching methods such as laser and dry texturization have been studied for multi crystalline silicon wafers. In this study, laser texturization with an Nd:$YVO_4$ green laser was performed first to get the proper hole spacing and $300{\mu}m$ was found to be the most proper value. Laser texturization on crystalline silicon wafers was followed by damage removal in acid solution and RIE to achieve double texturization. This study showed that double texturization on multi crystalline silicon wafers with laser firing and RIE resulted in lower reflectance, higher quantum yield and better efficiency than that process without RIE. However, RIE formed sharp structures on the silicon wafer surfaces, which resulted in 0.8% decrease of fill factor at solar cell characterization. While chemical etching makes it difficult to obtain a uniform surface texture for multi crystalline silicon solar cells, the process of double texturization with laser and RIE yields a uniform surface structure, diminished reflectance, and improved efficiency. This finding lays the foundation for the study of low-cost, high efficiency multi crystalline silicon solar cells.

탄소나노튜브

권준영,정학기,Kwon, Jun-Young,Jung, Hak-Kee 한국정보통신학회 2008 한국정보통신학회지 Vol.9 No.1

고수온에 의한 틸라피아 HSP70 유전자 발현과 Quercetin의 발현 억제 효과

권준영,김수미 한국발생생물학회 2011 발생과 생식 Vol.15 No.4

수온은 어류를 포함한 수중동물의 다양한 생물학적 사건에 영향을 미친다. 어류의 번식 및 발생도 수온의 변화와밀접한 관련이 있다. 어류를 높은 수온에 노출시키면 HSP70 유전자 발현을 유도한다. 따라서, HSP70 유전자 발현을 효과적으로 차단할 수 있는 저해제의 개발은 온도에 민감한 생물학적 사건과 관련된 HSP70의 역할을 연구하는데 크게 기여할수 있다. 본 연구에서는 고온(36℃)에 노출된 틸라피아 자어와 치어(전장 10~13 ㎝)에서 천연 flavonoid의 일종인 quercetin,3,3',4',5,7-pentahydroxyflavon의 “고온 유도 HSP70 유전자 발현” 억제효과를 조사하였다. 고온 노출 전에 50 μM 이상의quercetin 용액에 6시간 동안 사전 침지한 실험어에서는 HSP70 유전자 발현이 유의하게 감소하였다(P<0.05). 특히, 100μM로 침지 처리한 개체에서는 고온 처리를 하지 않은 실험어에서 만큼 낮은 HSP70 유전자 발현을 나타내었다. 한편,0.1 ㎖씩의 0.5 mM, 5 mM 또는 20 mM의 quercetin 용액을 치어에 주사한 결과, 고수온 유도 HSP70 유전자 발현은 0.5mM의 quercetin을 주사한 치어의 생식소와 뇌에서 모두 유의하게 감소되었다(P<0.05). 본 연구의 결과는 quercetin이 어류에서 고온에 의해 유도된 HSP70 유전자 발현을 효과적으로 차단할 수 있으며, 틸라피아 자어 침지의 경우 유효 농도 100 μM 그리고 치어 주사의 경우 유효 농도 0.5mM로 원하는 효과를 얻을 수 있음을 제시한다.