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이종접합 Gate 구조를 갖는 수평형 NiO/Ga<sub>2</sub>O<sub>3</sub> FET의 전기적 특성 연구
이건희 ( Geon-hee Lee ),문수영 ( Soo-young Moon ),이형진 ( Hyung-jin Lee ),신명철 ( Myeong-cheol Shin ),김예진 ( Ye-jin Kim ),전가연 ( Ga-yeon Jeon ),오종민 ( Jong-min Oh ),신원호 ( Weon-ho Shin ),김민경 ( Min-kyung Kim ),박철환 ( 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.4
Gallium Oxide (Ga<sub>2</sub>O<sub>3</sub>) is preferred as a material for next generation power semiconductors. The Ga<sub>2</sub>O<sub>3</sub> should solve the disadvantages of low thermal resistance characteristics and difficulty in forming an inversion layer through p-type ion implantation. However, Ga<sub>2</sub>O<sub>3</sub> is difficult to inject p-type ions, so it is being studied in a heterojunction structure using p-type oxides, such as NiO, SnO, and Cu<sub>2</sub>O. Research the lateral-type FET structure of NiO/Ga<sub>2</sub>O<sub>3</sub> heterojunction under the Gate contact using the Sentaurus TCAD simulation. At this time, the VG-ID and VD-ID curves were identified by the thickness of the Epi-region (channel) and the doping concentration of NiO of 1 × 10<sup>17</sup> to 1 × 10<sup>19</sup> cm<sup>-3</sup>. The increase in Epi region thickness has a lower threshold voltage from -4.4 V to -9.3 V at I<sub>D</sub> = 1 × 10<sup>-8</sup> mA/mm, as current does not flow only when the depletion of the PN junction extends to the Epi/Sub interface. As an increase of NiO doping concentration, increases the depletion area in Ga<sub>2</sub>O<sub>3</sub> region and a high electric field distribution on PN junction, and thus the breakdown voltage increases from 512 V to 636 V at I<sub>D</sub> =1 × 10<sup>-3</sup> A/mm.
Raping Translation in Translating Rape: A Case Study of The Bluest Eye
( Kim¸ Ga-hee ) 동국대학교 영어권문화연구소 2015 영어권문화연구 Vol.8 No.2
What this paper deals with is that how it would be then if a male translator happens to deal with rape of women in a woman writer's text that is written from a feminist perspective and if he would possibly, consciously or not, distort the feminist rape narrative in various ways because of his male identity. These research questions are brought from Chen's research, and this paper substantiates them by the analysis and comparison of the Korean translated texts. The recent studies in translation studies, including feminist translation theory, indicate male translators are influenced by gender awareness. Therefore this paper studying the translated texts of two male translators in terms of translating ‘rape’ and ‘incest’ in The Bluest Eye is considered worthwhile. The Bluest Eye written by Tony Morrison and its two different male translators' Korean versions are subject to the comparative analysis of this study.
Ga Eun Lee,Ryun Hee Kim,Taehwan Lim,Jaecheol Kim,Suna Kim,Keum Taek Hwang 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
This study aimed to identify ellagitannins in black raspberry (Rubus occidentalis) seeds (BS) and to optimize accelerated solvent extraction of ellagitannins using artificial neural network (ANN) coupled with genetic algorithm (GA). Ellagitannins were fractionated using Amberlite XAD-16N and Sephadex LH-20 resins. The ellagitannin fraction was qualitatively analyzed by HPLC-Q-TOF-MS/MS. BS had mainly monomeric and dimeric ellagitannins such as pedunculagin, castalagin, acutissimin A, sanguiin H-10, casuarictin, sanguiin H-2, sanguiin H-6, and sanguiin H-6 without a gallic moiety. For ANN modeling, extraction time (3-9 min), extraction temperature (40-70°C), and solvent concentration (50-100% acetone) were set as independent input variables, and total ellagitannin content was set as output variable. The ANN of this study had an input layer with three neurons, a hidden layer with ten neurons, and an output layer with one neuron. The optimal extraction conditions of the total ellagitannin content were predicted by the trained ANN coupled with GA. This study is the first attempt to analyze ellagitannin content in BS.
정철영,고재관,황원채,윤희철,박가열,김재호,이성식,김동승,표성일,이건남,양안나,최수정,김은석 한국직업능력개발원 2008 직업능력개발연구 Vol.11 No.1
이 연구의 목적은 제대군인에 대한 효율적인 전직지원을 위해서 현행 전직지원 프로세스에 대한 개선 안과 이에 따른 국방부, 국가보훈처 등 제대군인 전직지원관련 기관 간의 역할분담 및 연계방안에 대해서 제안하는 것이다. 연구는 크게 세 가지 과정을 거쳤다. 첫째, 국내 군 전직지원 실태를 분석하여 문제점과 시사점을 도출하였다. 둘째, 이러한 문제점과 시사점, 군 전직지원 선행연구를 종합하여 효율적인 군 전직지원 프로세스 안을 제시하였다. 셋째, 구축한 군 전직지원 프로세스 안에 따라 주요 군 전직지원 관련 기관인 국방부, 국가보훈처의 역할 분담 안을 제안하였다. This study aims to suggest an improvement plan for the support process of effective occupation change for discharged soldiers and then role assignments among related institutions for supporting discharged soldiers such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor and the cooperation plan among the institutions. The study was made in three steps. First, after analyzing currents support facts and status for discharged soldiers, it induced its problems and implications. Second, integrating the findings of previous studies related to support plan on occupation changes for the discharged soldiers, Problems and implications mentioned above, it constructed effective occupation change process for discharged soldiers. Then, according to the established process, it suggested role assignments such as Ministry of Defense, Ministry of Patriots and Veterans Affairs, Ministry of Labor.
Hydrothermal Liquefaction of Lignin to Bio-oil: Impact of Lignin Structure
Ga-hee KIM,Byung-hwan UM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Currently, most of the lignin produced in the pulping process is used almost as internal fuel. However, pulp mills have a surplus of energy, which provides them the opportunity to extract lignin and use it as a new source of special chemicals as well as fuel. In this work, the three kinds of various lignin were investigated in terms of structural properties and then, the relationship between structural properties of lignin and bio-oil productivity through hydrothermal liquefaction was evaluated. The chemical composition, structure, molecular weight, and thermal properties of lignin samples were analyzed using NMR, FTIR, GC/MS, EA and TGA. The hydrothermal liquefaction process was conducted at 350 ℃ for 30 min to produce bio-oil. The high potential of lignin and bio-oil as aromatic sources in the chemical industry will be explained, and these studies can reveal the value of lignin.
Kim, Seok Jin,Lee, Ga Yeon,Jang, Hye Ryoun,Choi, Jin-Oh,Kim, Jung Sun,Kim, Hee-Jin,Lee, Soo-Youn,Min, Ju-Hong,Jeon, Eun-Seok,Kim, Kihyun Informa UK Ltd. 2013 Amyloid Vol.20 No.4
<P>Autologous stem cell transplantation (ASCT) has improved the prognosis of selected patients with immunoglobulin amyloid light-chain (AL) amyloidosis. However, there exist little data regarding Asian patients receiving ASCT. We retrospectively analyzed 24 patients who were treated with ASCT for AL amyloidosis between 2007 and 2012. The median age at the time of ASCT was 56 years (range: 40-62 years), and in 63% of patients, the AL amyloidosis involved two or more organs. All patients except one received induction treatment such as cyclophosphamide, dexamethasone or thalidomide before ASCT, but only approximately half of these patients showed a hematologic response. After ASCT, the overall hematologic response was increased to 92% (22/24), which translated into increased organ response in 58% of patients (14/24). There was no transplantation-related mortality (0%) even though cardiac amyloidosis patients were included in our series. In conclusion, our results of ASCT in patients with AL amyloidosis were comparable to that of Western countries in terms of response and survival outcomes. Therefore, ASCT is an effective and feasible treatment approach for Asian patients with AL amyloidosis.</P>
High-performance Ce-substituted Nd-Fe-B hot-deformed magnets produced by dual alloy method
Ga-Yeong Kim,Tae-Hoon Kim,Hee-Ryoung Cha,Yang-Do Kim,Jung-Goo Lee 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
Nd-Fe-B magnets have been used for the traction motor of hybrid or electric vehicles due to its excellent magnetic properties. With increasing demand on Nd-Fe-B magnets, the shortage of Nd resource is becoming more serious. Ce and La is the most abundant rare earth elements and constitute more than 70% of the total rare earth element, and the price of Ce is about 10 times lower than Nd. Hence, from both industrial and academic viewpoints, it is a technologically important to develop high-performance Ce or La substituted Nd-Fe-B magnets. However, the magnetic properties of Nd-Fe-B magnets could be drastically deteriorated after replacing Nd with Ce and La due to inferior intrinsic magnetic properties of Ce₂Fe14B (4πMs = 11.7 kG, Ha = 26 kOe) and La₂Fe14B (4πMs = 13.8 kG, Ha = 20 kOe) compared to Nd₂Fe14B (4πMs = 16 kG, Ha = 73 kOe). Despite of the inferior intrinsic magnetic properties of Ce₂Fe14B and La₂Fe14B to Nd₂Fe14B, it is reported that deterioration of magnetic properties due to Ce and La substitution could be largely suppressed by constructing a multi-main-phase (MMP) structure in Nd-Fe-B sintered magnets. RE elements are inhomogeneously distributed within a 2:14:1 grains when sintering a mixture of Ce, La-free and Ce, La-containing RE₂Fe14B powders. Compared to single-main-phase (SMP) magnets, where Ce and La is homogeneously substituted Nd in the 2:14:1 phase, MMP magnets show much better magnetic performance. In this study, effect of dual-phase of Nd-Ce-Fe-B hot-deformed magnets using melt-spun powder was investigated. Initial ribbons with the nominal compositions of Nd13.6FebalB5.6Ga0.6Co6.6 and (Nd0.6Ce0.4)13.6FebalB5.6Ga0.6Co6.6 were prepared by a single-roller melt-spinning technique and then pulverized into powders. By tuning the mass ratios of the Ce-free and Ce-containing powder, Ce-containing magnets with 0-30 wt.% (named as ND, CE0.2 and CE0.3, respectively) Ce content were prepared by dual alloy method. The melt-spun powders were then hot-pressed and subsequently die-upsetted. In our previous study, the remanence and coercivity gradually decreased with increasing Ce content. This dependence of magnetic properties on Ce content could be ascribed to the magnetic dilution effect that Ce substitution for Nd in the 2:14:1 phase decreased the intrinsic magnetic properties. However, dual-phase hot-deformed magnets shows higher magnetic properties than single-phase hot-deformed magnets at the same composition. From SEM observation, it was confirmed that the Ce-free and Ce-containing area is quite different, the crystallographic alignment of Ce-containing area is inferior to that of Ce-free area. After annealing at 973 K, the composition of the flake interface changes due to interdiffusion during the annealing process. In sintered magnet, it has been reported that the peculiar chemical heterogeneity of dual-phase magnet is that the short-range exchange coupling and long-range magnetostatic interaction can induce higher remanence and coercivity simultaneously than those of single-phase magnets with the same composition. In this study as well, it is thought that the coercivity and remanence were improved due to the interdiffusion of elements between the flake interface by annealing. Compared to the Nd-Fe-B magnet (4πMr = 13.1 kG, Hc = 17.3 kOe), with CE0.3, Hc decreases drastically to 15.6 kOe, accompanied with significant falls in 4πMr to 11.5 kG. In contrast, for the dual-phase magnet with CE0.3, Hc reaches 16.74 kOe and 4πMr is 12.1kG, which are 7.3% and 9.2% higher than those of single-phase magnet, respectively. Based upon these results, effect of interdiffusion conditions of ma