수평형 ICP 플라즈마 시스템을 이용한 탄소나노소재의 저온합성 및 무결함 기능화 연구

趙成一 강원대학교 대학원 2023 국내박사

탄소는 원자 배열과 결합구조에 따라 0차원의 풀러렌, 1차원의 탄소나노튜브(Carbon nanotubes, CNTs), 2차원의 그래핀(Graphene), 3차원의 흑연 및 다이아몬드를 동소체로 갖는 원소이며, 물질에 따라 고유한 물성을 갖는 특징이 있다. 이 중, CNT와 그래핀은 본연의 우수한 물성들로 인해 최근 이차 전지, 플렉서블 디스플레이, 트랜지스터, 각종 복합체 등으로의 활용도가 계속 증가하고 있으며, 그 외에도 다양한 분야에서 많은 주목을 받고 있다. 하지만 두 소재의 가장 대표적인 합성 방법인 열화학기상증착법(Thermal chemical vapor deposition, TCVD)은 원료가스의 분해를 위해 800 ℃ 이상의 고온이 요구된다는 점과 응용 분야에 따라 요구되는 물성을 갖는 소재를 합성해야 한다는 점은 아직 해결해야 할 과제로 남아있다. 따라서 두 탄소나노소재의 양산화와 응용을 실현하기 위해서는 효율적인 소재 합성뿐만 아니라 물성의 향상 및 제어가 가능한 공정 기술이 요구된다. 이러한 배경 하에 본 연구에서는 유도결합 플라즈마(Inductively coupled plasma, ICP) 시스템이 결합된 TCVD 장치를 이용하여 두 탄소나노소재의 저온합성과 그래핀의 무결함 기능화를 수행하였으며, 이 때 전기적으로 부유 상태인 그리드(Grid)를 삽입하여 플라즈마의 에너지 제어를 시도하였다. 플라즈마와 그리드의 영향을 확인하기 위해 플라즈마의 광학적 진단법(Optical emission spectroscopy, OES)을 이용하였으며, 진단 결과를 기반으로 확산 영역의 위치에 따른 이온종의 밀도 및 플라즈마 내 전자온도(Electron temperature, Te)와 전자밀도(Electron density, ne)의 변화 양상을 관찰하였다. 이 때, Ar 이온 피크를 기준으로 사용하는 Boltzmann plot법을 적용하기 위해 총 가스 분율의 5 % 함량으로 Ar 가스를 혼합하였다. 결과적으로 CNTs는 450 ℃, 그래핀은 500 ℃까지 합성 가능성을 확인하였으며, 그래핀의 기능화 측면에서는 공정변수의 최적화를 통하여 결함 형성을 최소화하는 효율적인 도핑 조건을 확인하였다. 본 연구의 결과는 향후 CNTs와 그래핀의 실제 합성 및 물성 제어 기술 개발의 기초자료로써 기여가 가능할 것으로 기대한다. Carbon is an element that has 0-dimensional fullerene, 1-dimensional carbon nanotubes (CNTs), 2-dimensional graphene, 3-dimensional graphite and diamond as allotropes depending on the atomic arrangement and bonding structure. Depending on it, there are characteristics with unique physical properties. Among them, CNTs and graphene have recently been increasingly used in secondary battery, flexible display, transistor, and various composites due to their excellent physical properties, and are receiving a lot of attention in other fields. However, thermal chemical vapor deposition (TCVD), the most representative synthesis method of the two materials, requires a high temperature of 800 ° C or more for the decomposition of the feedstock gas, and it is difficult to synthesize a material with required physical properties depending on the application field. The point still remains a problem to be solved. Therefore, in order to realize the mass production and application of the two carbon nanomaterials, a process technology capable of improving and controlling physical properties as well as efficient material synthesis is required. Against this background, in this study, low-temperature synthesis of two carbon nanomaterials and defect-free functionalization of graphene were performed using a TCVD device combined with an inductively coupled plasma (ICP) system. Plasma energy control was attempted by inserting a grid. To confirm the effect of plasma and grid, optical emission spectroscopy (OES) of the plasma was used, and based on the diagnosis result, the density of ion species according to the location of the diffusion region and the electron temperature (Te) in the plasma were determined. and changes in electron density (ne) were observed. At this time, in order to apply the Boltzmann plot method using the Ar ion peak as a reference, Ar gas was mixed in an amount of 5% of the total gas fraction. As a result, the possibility of synthesizing CNTs up to 450 °C and graphene up to 500 °C was confirmed, and effective doping conditions that minimize defect formation were confirmed through optimization of process parameters in terms of graphene functionalization. The results of this study are expected to contribute as basic data for the actual synthesis of CNTs and graphene and the development of physical property control technology in the future.

유방암에서 p53과 c-erbB-2 단백 발현의 임상병리학적 의의

조성일 충북대학교 대학원 2000 국내석사

『청구야담(靑邱野談)』의 교재화 방안 연구

조성일 한국교원대학교 교육대학원 2022 국내석사

본 연구는 야담이 지닌 여러 교육적 가치를 토대로 『청구야담』을 교재화하는 것을 목적으로 한다. 2015 개정 국어과 교육과정을 바탕으로 한 고등학교 국어 교과서와 문학 교과서에는 야담은 한 편도 실려있지 않고 패설만 국어 교과서에 2편 실려 있다. 이 2편의 패설은 화법 영역 단원과 언어 영역 단원에서 선조들의 말하기 방식, 우리말의 관습 등의 학습을 위한 제재로서만 활용되고 있다. 교육 제재로서 야담은 교훈적인 내용이 많고, 다양한 가치관과 인생관을 담고 있으며, 삶에 대한 큰 관심을 바탕으로 당대 사람들의 현실적인 이야기를 담고 있다. 학습자들은 야담을 통해 세상을 바라보는 균형잡힌 시선을 갖출 수 있고, 고전문학에 대해 갖고 있던 거리감과 막연한 두려움, 거부감을 줄일 수 있으며, 당대 사람들의 삶과 자신의 삶을 연관지어 감상하여 고전에 대한 친밀감과 흥미를 형성할 수 있다. 이처럼 야담이 교육적으로 분명한 가치가 있음에도 교육 제재로 활용되고 있지 않기 때문에 방과후수업을 통해 야담의 가치를 입증해 보았다. ‘문학사적 맥락을 고려하여 야담을 감상할 수 있다.’, ‘야담이 담고 있는 의미를 자신의 삶과 연관지어 친구들과 토론할 수 있다.’, ‘야담과 관련하여 토론한 내용을 바탕으로 자신의 생각을 글로 표현할 수 있다.’라는 학습 목표를 설정하고, 『이조한문단편집』을 기본 교재로 하여 10차시의 수업을 진행했다. 수업을 통해 학습자들은 당대의 상황과 그 시대를 살아가던 사람들이 보여주었던 다양한 가치관과 인생관을 이해하고, 자신이 현재 살고 있는 사회와 문화에 대한 폭넓은 안목을 형성하였으며, 문학 작품과의 소통을 통해 자신의 삶을 성찰하는 모습을 보였다. 이에 따라 야담을 교육 제재로 활용하기 위해 『청구야담』의 작품 중 학습자들에게 흥미를 줄 수 있으면서 현대 사회에서도 여전히 의미있는 가치를 전하고 있으며, 비판적 감상과 함께 토론을 가능하게 하는 논쟁적인 주제를 담고 있는지를 기준으로 하여 ‘한밤에 삶은 돼지를 싸서 친구 집을 찾아가다(裹蒸豚中夜訪神交)’, ‘평안감사가 옛이야기를 털어놓은 흉악한 중을 잡다(捉凶僧箕城伯話舊)’, ‘전동흘이 재상감을 알아보다(田統使微時識宰相)’ 세 작품을 선정했다. 선정된 작품의 교육 요소와 성취기준을 연계하여 ‘문학사의 흐름을 고려하여 야담을 감상할 수 있다.’, ‘야담에 담긴 사회·문화적 가치를 이해하고 평가하여 친구들과 토론할 수 있다.’, ‘주체적인 관점에서 야담을 해석하고 평가하여 문학을 생활화하는 태도를 지닐 수 있다.’는 학습 목표를 설정하고 5차시의 교수·학습 과정안과 보충학습 자료 및 평가 자료를 제시하였다. 본 연구를 통해 지금까지 국어 교육에서 소외되었던 야담의 교육적 가치를 재발견하고 야담을 수업에 적극적으로 활용하는 방안에 대한 고민과 함께 고전문학이 학습자들의 삶에 한 걸음 더 가까워져 학습자들이 문학을 생활화 할 수 있는 바탕이 마련되기를 기대한다.

프로팀 코치의 리더십에 대한 선수의 만족도 연구

조성일 경원대학교 2003 국내석사

반복 학습 제어 알고리즘을 이용한 외란에 강인한 서보 제어기 구현

조성일 서울大學校 大學院 1995 국내석사

후두 편평세포암종에서 Galectin-3과 Pim-1의 발현

조성일 조선대학교 대학원 2007 국내석사

To assess the significance of Galectins and Pim-1 protein in larynx tumors and their correlation with prognostic factors, samples from 77 patients with squamous cell carcinomas of larynx were studied immunohistochemically. In the present study, the author examined the correlations of Galectin-3 and Pim-1 protein expression according to tumor stages, nodal status, clinical stages and histologic differentiation to investigate the clinical significance. Squamous cell carcinoma showed increased Galectin-3 and Pim-1 expression in more advanced stage, tumor stage and nodal status. So it was suspected that the pathogenetic role of Galectin-3 and Pim-1 expression in laryngeal squamous cell carcinoma. And it indicates that Galectin-3 and Pim-1 can be used as a possible prognostic factor.

臍帶動. 靜脈血奬 Progesterone値에 關한 硏究

조성일 朝鮮大學校 1986 국내석사

The umbilical venous and arterial progesterone concetrations were determined in 44 pregnancies by radioimmunoassay. The mean ± SE plasma progesterone in the umbilical vein was 170 ± l28 ng/ml, and in the umbilical artery it was 665 ± 106ng/ml with an arteriovenous difference of 964±82 ng/ml. There was no significant difference in these paramers between male and female fetuses and mode of delivery. It was therefore concluded that the fetal genotype and stress on the fetus did not appear to significantly affect fetal extraction and utilization of progesterone.

후두 편평세포병변에서 CD44v3의 발현

조성일 조선대학교 2004 국내석사

Background and Objectives : Laryngeal squamous cell carcinoma is an aggressive malignancy in which the early diagnosis of premalignant lesions is known to directly correlate with increased survival. However, only a portion of biopsies showing dysplasia will progress to cancer, and there are no currently accepted criteria for predicting which lesions that are likely to become head and neck cancer are required. Because conventional histology is unable to predict which lesions are likely to pregress to cancer. Here the author describes the identification of CD44v3 as one such molecular biomarker for layngeal squamous cell carcinoma that may be useful specifically for predicting which premalignat lesions will progress to invasive laryngeal cancer. Materials and Method : Paraffin-embedded tissue specimens from 40 patients, who were diagnosed as laryngeal invasive squamous cell carcinoma(10 cases), carcinoma in situ(10 cases), dysplasia(10 cases), and hyperkeratosis(10 cases) between 1993 and 2002, were immunohisto-chemically stained for CD44v3 protein. Results : In invasive squamous cell carcinoma, expression of CD44v3 was diffusely strongly positive reaction, and in carcinoma in situ, it was diffusely 3+~2+ reaction. However, in dysplasia and hyperkeratosis, the proportion of CD44v3 expression was decreased such as 2+~1+, 1+~0, respectively. Conclusion : These results suggest that expression of CD44v3 in laryngeal lesions seemed to be associated with tumorigenesis and invasion. The strongly positive expression of CD44v3 in laryngeal specimen may be represent laryngeal squamous cell carcinoma and invasive growth.

나노구조 ZnO의 morphology 제어 및 표면개질을 통한 염료감응형 태양전지 효율향상

조성일 대구가톨릭대학교 대학원 2018 국내석사

Zinc oxide (ZnO) has a band gap energy of 3.3 eV, which is similar to that of TiO2 used as a n-type semiconductor in conventional dye-sensitized solar cells (DSSCs), and has higher electron mobility than TiO2. Thus, ZnO film can act as the n-type semiconductor in DSSCs. In this study, thin ZnO layer playing a role of both seed layer of rods and hole-blocking layer in DSSCs was formed on F-doped tin oxide (FTO) glass by spin coating of zinc acetate solution followed by heat treatment, and then ZnO roads on the film were deposited by chemical bath deposition using zinc nitrate solution. The resulting layers were applied to the photoelectrodes of DSSCs, and photovoltaic properties of the DSSCs were investigated with growth temperature and time of ZnO roads. Vertically aligned ZnO nanorods were densely formed at 70℃ of the growth temperature, whereas ZnO microrods was randomly distributed on the FTO electrode when the temperature was elevated to 90℃. With increasing the growth time (4, 6, 8 and 10 hr), the ZnO thickness was increased from 7.1 to 10.6 μm for the nanorods and from 6.8 to 13.1 μm for the microrods. The highest power conversion efficiency (PCE) was achieved in DSSCs with the ZnO nanorods which was grown at 75℃ for 8 hr, rather than 90℃ for 8hr. It was because the ZnO nanorods were vertically aligned to the FTO electrode and more dense, compared to those grown at 90℃. Meanwhile, the surface of the ZnO nanorods was modified with silver nitrate to get higher conversion efficiency of ZnO-based DSSCs. By a simple dipping in an aqueous solution of silver nitrate for 20 min, silver-ion incorporated ZnO layer was easily obtained. DSSC with the silver-ion incorporated ZnO layer showed a PCE of 1.186% with 3.51 mA/cm2 of short-circuit current (JSC), 674 mV of open-circuit voltage (VOC) and 50.14 % of fill factor (FF). When compared with that (0.619 %) of the reference device with bare ZnO nanorods (JSC = 2.25 mA/cm2, VOC = 646 mV, and FF = 42.53 %), about a 91.6 % enhancement in PCE was achieved. It was revealed that the sharp improvement in PCE was attributed to an increased amount of adsorbed dye on the surface of ZnO nanorods and a retarded back electron transfer between photoinjected electrons and I3- in the electrolyte.

地下貯藏空洞 建設을 위한 斷裂岩盤의 地下水體系 評價方法 硏究

조성일 忠南大學校 2005 국내박사

This study aims to evaluate the hydrogeological system of large scale storage caverns under construction in a volcanic rock mass in the Yeosu peninsula. In general, the porous continuum concept is still used for the hydrogeological design and safety evaluation on underground storage facilities. In this study, the fracture hydrological approach is used for the hydrogeological assessment of the site. The fracture analysis of surface and tunnel mapping data and of the BHTV data from the drilling holes were carried out. For the hydrogeological analysis, the hydraulic tests data, the evolution of groundwater levels in the surface monitoring boreholes and the variation of water curtain hole pressures in the caverns were utilized. The hydrogeologic system in the study area is characterized by two major fracture zones (F1-1 and F1-3 zones) acting as a hydraulic boundary with the existing storage facilities. In the F1-1 zone, the groundwater levels are shown a great difference between the upper and lower levels in the range of 7 - 170 m measured from the double completed monitoring holes. This might be resulted from the poor hydraulic connectivity and very low hydraulic conductivity (7 × 10^(-10) ~ 5 × 10^(-9) m/sec) in the zone, in turn low groundwater recharge rates. On the other hand, the F1-3 zone has a relatively less difference between the upper and lower groundwater levels in the range of 10 and 40 m and has a low hydraulic conductivity of 4 ~ 5 × 10^(-9) m/sec, indicating relatively higher hydraulic connectivity than the F1-1 zone. At the cavern level, the Hydraulic Conductor Domain (fracture zones) is characterized one local major fracture zone (NE-1 of N50°E/90°) and two local fracture zones (NW-1 of N20°W/90°, NW-2 of N50°W/90°). The background fractures in a Hydraulic Rock Domain (rock mass) can be characterized by a statistical terms. The background fracture sets based on the orientation are identified as three subvertical sets and one subhorizontal set. The trace lengths of each set ranges from 1.81 to 2.82m and the fracture frequency in terms of P32 (fracture density) ranges from 0.003 to 0.074. The hydraulic conductivity of the Hydraulic Conductor Domain is in range of 1 x 10^(-8) and 1 x 10^(-9) m/s, whereas that of the Hydraulic Rock Domain ranges from 4 x 10^(-9) to 7 x 10^(-10) m/s, indicating the low to very low permeable media. The porous continuum approaches for fractured rock masses can improve its reliability by using a numerical model with more refined Hydraulic Conductor Domains and Hydraulic Rock Domains. Since the importance of input parameters for a model is varied between the transitional or steady state analysis, the more attention is necessitated on the accurate primary data analysis of the related input parameters (recharge rate, storage coefficient, specific yield) on the analysis of interest (inflow rate, evolution of the groundwater level etc.) The identification of conductive features from a surface based site investigation is still great challenges for a underground cavern site, which is mainly resulted from the irregularity of fracture orientations and extends. To deviate this problem, the systematic qualitative analysis for fractures on the BHTV images is essential as well as a statistical analysis. For the evaluation of hydraulic connectivity for identified fractures, Flow logging test should be carried out in an early stage followed by the installation of a multi-packer system on the fractures of interest.