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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.
The Timing of Aromatase Action for Sex Differentiation in the Nile Tilapia, Oreochromis niloticus
권준영,권혁추 한국발생생물학회 2006 발생과 생식 Vol.10 No.3
어류의 체내에서 성분화를 유도하는 물질이 성스테로이드호르몬(sex steroid hormone)이라는 사실이 잘 밝혀져 있으며, 성스테로이드 생합성 효소의 하나인 aromatase도 성분화에 직접적인 역할을 하는 것으로 알려져 있다. 본 연구에서는 유전적으로 암컷인 틸라피아 자어(larvae) 집단을 aromatase 저해제(aromatase inhibitor, AI)인 Fadrozole로 침지 처리하여 초기 발생단계 중 어느 시기에 aromatase가 Sex steroids are generally considered as natural sex inducers in fish, and aromatase (cytochrome P450 aromatase) that catalyzes androgens into estrogens in the steroidogenic pathway is also known to be involved in sex differentiation. The timing of aromatase action is, thus, of central importance in the study of fish sex differentiation. We treated sexually undifferentiated tilapia (Oreochromis niloticus) larvae with , a non-steroidal aromatase inhibitor (AI), by immersing the fish in a solution containing AI during the sex differentiation period to narrow down the critical period of aromatase action. Fish were treated once at 11 or 13 days post fertilization (dpf), or twice at 11 and 13 dpf. The concentrations of AI at each time of the treatment were 0 mg/L (control), 50 mg/L or 100 mg/L. Survival rate was not statistically associated with AI immersion treatment (p>0.25). However, sex ratio was significantly altered by the treatment, with higher concentration and double immersion being more effective in masculinizing genetic females (p<0.05). These results suggest that aromatase action for sex differentiation in this fish species would begin at least from 11 dpf which is much earlier than previously expected, and that only 3 hours of brief immersion in AI solution is powerful enough to alter genetically programed sex.
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.
Micro electrical discharge drilling characteristics of conductive SiC–Ti 2 CN composite
권준영,장성훈,권원태,김욱영 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
An electrically conductive SiC-Ti 2 CN composite was fabricated from β-SiC and TiN powders with 2 vol% equimolar Y 2 O 3 -Sc 2 O 3 additives by conventional hot-pressing. The composite (electrical resistivity of nearly 10 -4 Ω·cm) was wire electro discharge machined into a specimen having a thickness of 500 μm. Entrance clearance, machining time, number of shorts, material removal rate (MRR), counts, and the effects of the capacitance and voltage of conductive SiC-Ti 2 CN composite during micro electrical discharge drilling were measured and compared to those of SUS304. As the unit discharge energy increased, entrance clearance, machining time, and number of shorts decreased. A decrement in the number of shorts was the main reason for decrements in entrance clearance and machining time. MRR was proportional to unit discharge energy. The study to determine the location of shorts during electro discharge drilling was also conducted. It was founded that the short circuit occurred mainly at the beginning (0–1000 cts) because of low electrical density, and right before the exit (3000–5000 cts) owing to the difficulty of removing debris. Both the capacitance and voltage tended to be inversely proportional to the number of shorts.
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.
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.
권준영,전수환,이혜란,한지연,김동일 한국식물생명공학회 2009 식물생명공학회지 Vol.36 No.4
Transgenic plant cell cultures for the production of biopharmaceuticals including monoclonal antibodies, recombinant proteins have been regarded as an alternative platform in addition to traditional microbial fermentation and mammalian cell cultures. Plant-made pharmaceuticals (PMPs) have several advantages such as safety, cost-effectiveness, scalability and possibility of complex post-translational modifications. Increasing demand for the quantity and diversity of pharmaceutical proteins may accelerate the industrialization of PMP technology. Up to date, there is no plant-made recombinant protein approved by USFDA (Food and Drug Administration) for human therapeutic uses due to the technological bottlenecks of low expression level and slight differences in glycosylation. Regarding expression levels, it is possible to improve the productivity by using stronger promoter and optimizing culture processes. In terms of glycosylation, humanization has been attempted in many ways to reduce immune responses and to enhance the efficacy as well as stability. In this review article, all these respects of transgenic plant cell cultures were summarized. In addition, we also discuss the general characteristics of plant cell suspension cultures related with bioreactor design and operation to achieve high productivity in large scale which could be a key to successful commercialization of PMPs. 형질전환 식물세포 배양은 동물유래 바이러스로부터 안전하며 그에 따라 정제비용을 절감할 수 있으며, 값싼 배지가격으로 고가의 바이오의약 단백질의 대체생산 시 스템으로 각광받고 있다. 하지만 식물 고유의 당쇄화 유 형과 기존 생산시스템에 비해 낮은 생산성으로 인해 아 직까지 허가된 사례가 없는 실정이다. 이를 해결해기 위 해 중점적으로 수행되어야 할 분야로는 PMP 당쇄의 인 간화와 낮은 생산성을 극복하기 위한 강력한 프로모터 의 개발을 들 수 있다. 또한 고부가가치의 바이오의약 단백질 시장에서 식물세포 대량배양 및 상업화를 위해 서는 bioreactor 배양 및 공장의 설립이 필수적이기 때문 에, 식물세포에 적합한 bioreactor의 종류를 선정하여 최 적의 공정을 개발하는 것이 중요하다. 또한 식물세포 bioreactor 배양에서 고려사항들에 대한 총체적인 이해가 필요하며, 공정 및 배지최적화를 통해 생산성 증대와 재 현성 있는 생산시스템의 확립이 가능할 것이다. 근 미래 에 바이오의약 단백질 시장의 새로운 생산시스템으로서 한 축을 담당할 수 있을 것으로 사료된다.