단어출현빈도분석과 AHP를 통한 기술 연구 동향과 기대 효과 분석: 바이오 에너지 분리막을 중심으로

이인우(Lee, In-Woo),서한결(Seo, Han-Gyeol),장수진(Jang, Soo-Jeen),조철희(Cho, Churl-Hee),정양헌(Chung, Yang-Hon) 한국경영교육학회 2020 경영교육연구 Vol.35 No.5

[연구목적] 본 연구는 과학 기술 연구 동향과 기술 도입 기대 효과를 함께 분석하는 방안을 바이오 에너지 분리막 분야에 적용하여 연구개발 전략 제시에 도움이 되는 연구 방안을 제시하고자 하였다. [연구방법] 본 연구는 분리막 기술 연구 방향과 기대효과를 분석하기 위해 각각에 대해 두 가지 연구방법을 이용하였다. 우선 텍스트 마이닝을 통해 단어출현 빈도분석으로 선행연구의 연구 방향을 확인하였고, AHP를 통해 기대효과를 알아보았다. [연구결과] 분석결과 분리막 기술의 연구 방향은 주로 분리막 관련 다양한 공정과 공정개선을 통한 성능 향상에 있는 것으로 확인되었다. 분리막 기술을 통한 기대 효과는 바이오 에너지 공정에서 발생하는 환경 문제 해결이 주된 것으로 나타났다. [연구의 시사점] 분리막 관련 연구는 분리막 성능에 중점을 두고 진행되고 있으며 분리막을 실제 공정에 도입하는 측에서 기대하는 부분은 분리막 도입으로 인한 효과와 분리성능 향상에 의한 효과에 중점을 두고 있음을 확인하였다. 이는 분리막 기술 연구가 실제 니즈를 잘 반영하여 이루어지고 있음을 보여준다. 이처럼 특정 기술의 연구 방향과 도입에 따른 기대효과를 함께 분석할 수 있으며, 이는 연구개발 전략 제시에 도움이 될 수 있음을 확인하였다. [Purpose] Purpose of this study is to propose a research methodology that is helpful in presenting the R&D strategy by applying analysis on research trends and expected effect of technology introduction together in the field of bioenergy membranes. [Methodology] For this purpose, we used two research methodologies. Word frequency analysis of text mining was used to analyze the research trends of previous studies, and the expected effect was investigated through AHP. [Findings] This study found that the research trends of membrane is mainly to improve performance through various processes and expected effect focus on environmental problem solving arising from bioenergy process. [Implications] It was confirmed that main research trends of membrane is performance of membrane and expected effect is performance improvement by introduction of membrane in bioenergy processes. This shows that research on membrane is well reflected in actual needs. This methodology can be helpful in presenting the consumer-oriented R&D strategy.

급속응고한 고합금 고속도 공구강의 미세조직 특성

이인우,김명호 ( In Woo Lee,Myung Ho Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.3

N/A Highly alloyed high speed tool steels(ASP steels) were rapidly solidified by melt spinning process, and the microstructures of melt spun tool steel ribbons were examined by optical microscopy and transmission electron microscopy with energy dispersive x-ray spectroscope. The microstructure of melt spun tool steel ribbon was found to be consisted of δ-ferrite cells surrounded by austenite and V-rich MC carbides. The size of δ-ferrite cells and intercellular MC carbides were about 0.4㎛ or less and 30㎚ or less, respectively. From the melt spun tool steel ribbons, only the MC type carbide phase was observed, instead of M₂C, M_(23)C_6 and M_6C carbides which were generally observed in other rapidly solidified high speed steels. Such a change in type of carbide phase formed could be attributed to the increase in alloying content of vanadium and carbon. However, changes in microsturcture of melt spun tool steels with alloying content of cobalt, vanadium and carbon were not observed.

TiN박막 성장거동에 미치는 증착온도의 영향

이인우,남옥현,김문일 ( In Woo Lee,O . H . Nam,Moon Il Kim ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.4

Extensive reseach has been performed on the process condition-micro structure-stress relations of TiN film. The various proposed models are mainly base on physical vapor deposition processes. Especially the study on the micro-structure and deposition condition has not been sufficient in TiN deposited by PECVD. In this study, therefore, we discussed the morphological changes of TiN films by PECVD with different temperature and pressure, and compared it with the structure zone model. We could find out chat the oxygen and chlorine contents and the texture coefficient increased with deposition temperature, and the morphology of TiN transformed from Zone 1 to Zone T, but deposition pressure didn`t remarkly affected.

급속응고한 Al-Mg-Be 합금의 미세조직 및 인장특성

이인우,박현호,김명호 ( In Woo Lee,Hyun Ho Park,Myung Ho Kim ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.4

N/A Twin roll quenched Al-Be ribbons were vacuum hot-pressed at 450℃ under 100㎫ and hot-extruded with reduction in area of 25:1 at 450℃. The extruded Al-Be ribbons consisted of refined Al grains and homogeneously dispersed fine Be particles, and exhibited improved tensile properties with increasing of solidification rate and Be contents. Also in order to develop a light weight-high strength Al alloy, rapidly solidified Al-Mg-Be alloy system was studied. Rapidly solidified Al-Mg-Be alloy by twin roll quenching process was vacuum hot -pressed and subsequently hot-extruded. Compared with extruded Al-Mg ribbons, extruded Al-Mg-Be ribbons exhibited finer recrystallized grains and improved tensile properties, as subgrain boundaries of extruded Al-Mg-Be ribbons were pinned by fine Be particles. With increasing of solidification rate and Mg contents, extruded Al-Mg-Be ribbons exhibited very fine recrystallized grains and improved tensile properties. These tendencies could be due to promoted recrystallization by refined Be particles. T4 treatment for the extruded Al-13Mg-1Be ribbons was found to improve the elongation, possibly by the resolution of Al₃Mg₂at grain boundaries.

급속응고한 Al-Be 합금의 미세조직 및 인장특성

이인우,박현호,김명호 ( In Woo Lee,Hyun Ho Park,Myung Ho Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5

N/A For high performance aerospace structures, the properties of highest priority are low density, high strength, and high stiffness(modulus of elasticity). Addition of beryllium decrease the density of the aluminum alloy and increase the strength and the stiffness of the alloy. However it is very difficult to produce the Al-Be alloy having useful engineering properties by conventional ingot casting, because of the extremely limited solid solubility of beryllium in aluminum. So, rapid solidification processing is necessary to obtain extended solid solubility. In this study, rapidly solidified Al-6 at% Be alloy were prepared by twin roll melt spinning process and single roll melt spinning process. Twin roll melt spun ribbons were extruded at 450℃ with reduction in area of 25 : 1 after vacuum hot pressing at 550℃ and 375℃. The microstructure of melt spun ribbon exhibited a refined cellular microstructure with dispersed Be particles. As advance velocity of liquid/solid interface increase, the morphology of Be particle vary from rod-like type to spherical type and the crystal structure of Be particle from HCP to BCC. These microstructural characteristics of rapidly solidified Al-6at.%Be alloy were described on the basis of metastable phase diagram proposed by Perepezko and Boettinger. The extruded ribbon consisted of recrystallized grains dispersed with Be particles and exhibited improved tensile property compared with that of extruded ingot.

질소 플라즈마 처리된 활성탄소를 이용한 테트라사이클린의 물리 및 화학 흡착 특성

이인우 ( In Woo Lee ),명성재 ( Seongjae Myeong ),민충기 ( Chung Gi Min ),하성민 ( Seongmin Ha ),천서영 ( Seoyeong Cheon ),이영석 ( Young-seak Lee ) 한국공업화학회 2024 공업화학 Vol.35 No.1

본 연구에서는 활성탄소의 테트라사이클린 흡착성능을 향상시키기 위해 5, 10, 및 15분의 시간에 따른 질소 플라즈마 처리를 실시하였다. 모든 질소 플라즈마 처리된 활성탄소는 미처리 활성탄소와 비교하여 테트라사이클린 흡착성능이 개선되었다. 이는 활성탄소에 도입된 질소 작용기가 테트라사이클린과 π-π 상호작용 및 수소 결합을 통하여 화학 흡착을 야기하기 때문이다. 특히, 80 W 및 50 kHz의 질소 플라즈마 처리에서, 10분 동안 처리된 활성탄소가 가장 우수한 흡착성능을 가졌다. 이 때, 활성탄소 표면의 질소 함량은 2.03%이며 비표면적은 1,483 ㎡/g까지 증가하였다. 이렇게 질소플라즈마 처리에 의해 개선된 활성탄소는 물리 및 화학 흡착성능이 향상되었다. 또한, 흡착 실험 결과가 Langmuir 흡착등온식과 유사 2차 반응속도식에 잘 부합하므로, 질소 플라즈마 처리된 활성탄소의 테트라사이클린 흡착은 단분자층으로 이루어지는 화학 흡착이 주도적으로 일어나는 것으로 판단하였다. 결과적으로, 질소 플라즈마 처리된 활성탄소는 주도적인 화학 흡착과 더불어 물리 흡착의 시너지 효과로 수중에서 테트라사이클린을 효율적으로 제거하는 흡착재로 사용될 수 있다. In this study, nitrogen plasma treatment was performed in 5, 10, and 15 minutes to improve the tetracycline adsorption performance of activated carbon. All nitrogen plasma-treated activated carbons showed improved tetracycline adsorption compared to untreated activated carbons. The nitrogen functional groups in activated carbon lead to chemisorption with tetracycline via π-π interactions and hydrogen bonding. In particular, in the nitrogen plasma treatment at 80 W and 50 kHz, the activated carbon treated for 10 minutes had the best adsorption performance. At this time, the nitrogen content on the surface of the activated carbon was 2.03% and the specific surface area increased to 1,483 ㎡/g. As a result, nitrogen plasma treatment of activated carbon improved its physical and chemical adsorption capabilities. In addition, since the adsorption experimental results were in good agreement with the Langmuir isotherm and pseudo-second order model, it was determined that the adsorption of tetracycline on the nitrogen plasma-treated activated carbon was dominated by chemical adsorption through a monolayer. As a result, nitrogen plasma-treated activated carbon can be used as an adsorbent to efficiently remove tetracycline from water due to the synergistic effect of physical adsorption and proactive chemical adsorption.

중국의 데이터 자원화와 미중 전략경쟁의 성격 변화

이인우 ( In-woo Lee ),이희옥 ( Hee-ok Lee ) 경남대학교 극동문제연구소 2021 한국과 국제정치 Vol.37 No.2

본 연구는 일반목적기술(GPT)에 의한 디지털 전환의 결과 새로운 자원으로 등장한 데이터를 중심으로 미중 관계를 분석했다. 민군겸용 기술인 디지털 기술이 데이터를 연료로 소모하기 때문에 데이터 자원의 확보는 국력 향상에 필수적이다. 미국과 중국은 디지털 전환 사회로 빠르게 진입하였고 데이터 경쟁력을 확보하기 위해 디지털 전환의 심화와 데이터 거래를 촉진하고 있다. 그 결과 중국은 집중성에서, 미국은 다양성에서 비교우위가 있으나 현재 중국은 다양성의 한계를 보완하고자 주변국과의 연계를 강화하고 있다. 한편 데이터 경쟁력 확보 과정에서 데이터 자원의 특성상 중요정보 유출이라는 외부효과가 발생하며 이를 통제하면서 데이터를 효율적으로 활용하기 위해서는 데이터 거버넌스가 중요하다. 민주주의 체제인 미국은 복잡한 절차, 인권침해 문제 등 정부의 데이터 활용에 많은 제약이 있으나 권위주의 체제인 중국은 정부가 국내에서 발생하는 모든 데이터에 빠르게 접근할 수 있다. 즉, 중국은 경쟁력 있는 데이터를 국가 전략자원으로 활용하기 용이하다. 미국이 가치 동맹외교를 통해 중국의 체제를 비난하면서 디커플링을 추진하는 핵심은 중국의 데이터 전략을 견제하고 패권을 유지하는 데 있다고 보았다. This study analyzes the U.S.-China relationship, focusing on data that emerged as a new resource as a result of digital transformation by GPT. Securing data resources is essential to improving national power because digital technology, a dual-use technology, consumes data as fuel. The U.S. and China are promoting digital transformation and data transactions to secure data competitiveness. As a result, China has a comparative advantage in “depth” and the United States in “diversity”, but China is now strengthening its links with neighboring countries to compensate for the limitations of diversity. Meanwhile, due to the nature of data resources, data governance is important to control the externality problem. The U.S., a democratic system, has many restrictions on the use of government data, including complicated procedures and human rights violations, but China, an authoritarian system, has quick access to all domestic data. In other words, China is easy to utilize competitive data as a national strategic resource. To check China's data strategy, the U.S. is pushing for decoupling, criticizing China’s system through value alliance diplomacy.

가사도 화산성 천열수 금은광상의 열수변질대 분포 및 성인 - 탐사에의 적용

김창성(Chang Seong Kim),최선규(Seon Gyu Choi),최상훈(Sang Hoon Choi),이인우(In Woo Lee) 한국광물학회 2002 광물과 암석 (J.Miner.Soc.Korea) Vol.15 No.3

The gold-silver deposits in the Gasado district were formed in the sheeted and stockwork quartz veins which fill the fault fractures in volcanic rocks. K-Ar dating of alteration sericite(about 70 Ma) indicates a Late Cretaceous age for ore mineralization. These veins are composed of quartz, adularia, carbonate, and minor of pyrite, sphalerite, chalcopyrite, galena, Ag-sulfosalts (argentite, pearceits, Ag-As-Sb-S system), and electrum. These veins are characterized by chalcedonic, comb, crustiform and feathery textures. Based on the hydrothermally altered mineral assemblages, regional alteration zoning associated with mineralization in the Gasado district is defined as four zones; advanced argillic (kaolin mineral-alunite-quartz), argillic (kaolin mineral-quartz), phyllic (quartz-sericite-pyrite) and propylitic (chlorite-carbonate-quartz-feldspar-pyroxene)zone. Phyllic and propylitic zones is distributed over the study area. However, advanced argillic zone is restricted to the shallow surface of the Lighthouse vein. Compositions of electrum ranges from 14.6 to 53.7 atomic % Au, and the depositional condition for mineralization are estimated in terms of both temperature and sulfur fugacity: T=245°∼285℃, logf_s2=10^-10∼10^-12. Fluid inclusion and stable isotope data show that the auriferous fluids were mixed with cool and dilute (158°∼253℃ and 0.9∼3.4 equiv. wt. % NaCl) meteoric water (δ^-18O_water=10.1∼8.0‰, δD=-68∼-64‰). These results harmonize with the hot-spring type of the low-sulfidation epithermal deposit model, and atrongly suggest that Au-Ag mineralization in the Gasado district was formed in low-sulfidation alteration type environment at near paleo-surface.

비스포스포네이트 관련 악골괴사에 대한 후향적 연구

한윤식(Yoon-Sic Han),이인우(In-Woo Lee),이 호(Ho Lee),서진원(Jin-Won Suh),김성민(Soung-Min Kim),명 훈(Hoon Myoung),황순정(Soon-Jung Hwang),최진영(Jin-Young Choi),이종호(Jong-Ho Lee),정필훈(Pill-Hoon Choung),김명진(Myung-Jin Kim),서병 대한구강악안면외과학회 2011 대한구강악안면외과학회지 Vol.37 No.6

Introduction: The incidence of bisphosphonate-related osteonecrosis of the jaw (BRONJ) has increased gradually in patients who have undergone surgical treatment for osteomyelitis. In this study, a retrospective analysis of BRONJ patients was carried out using the data of osteomyelitis patients treated surgically. Materials and Methods: Osteomyelitis patients, who underwent curettage, sequestrectomy, saucerization or decortications, and partial mandibulectomy at Seoul National University Dental Hospital from 2004 to 2010 were enrolled in this study. The patients were classified and categorized into two groups based on the surgical records and progress notes. One group comprised of patients with osteomyelitis and osteoporosis, and the other group included patients with osteomyelitis only. The epidemiological data of the BRONJ patients was analyzed to identify any trend in the incidence of BRONJ in osteomyelitis patients. Results: Among 200 patients who underwent surgical intervention for osteomyelitis, 64 (32.0%) were identified as having osteoporosis as the underlying disease. In these 64 patients, more than 81.3% had been prescribed bisphosphonates. Females were far more affected by BRONJ than males. The incidence of BRONJ also increased with age. The posterior part of the mandible was affected more frequently by BRONJ. Conclusion: Although the availability of potent antibiotics and increased oral hygiene care can reduce the overall incidence of osteomyelitis, BRONJ can increase the total incidence. To prevent BRONJ, it is recommended that an oral examination be performed before prescribing bisphosphonates. Moreover, the patients should be educated about the potential risks of dental procedures that might be causal factors for BRONJ. Furthermore, patient swho take bisphosphonates for the treatment of osteoporosis should undergo periodic follow up oral examinations to prevent BRONJ.

Human Peripheral Polymorphonuclear Leukocyte에 대한 Proinflammatory Cytokinessl의 작용

송요한,외귀옥,이인규,소서영,문대희,이인우,김형섭,Song, Yo-Han,Oh, Kwi-Ok,Lee, In-Kyu,So, Seo-Young,Moon, Dae-Hee,Lee, In-Woo,Kim, Hyyng-Seop 대한치주과학회 1995 Journal of Periodontal & Implant Science Vol.25 No.2

Human polymorphonuclear leukocytes(PMN) are the most numerous host cell in periodontal pockets and their presumed role is to form a protective barrier between the bacteria and periodontal tissues. Microbial component LPS activates macrophages to produce $IL-1{\beta}$, $MIP-1{\alpha}$, $-1{\beta}$, $TNF-{\alpha}$ and IL-6, etc. These cytokines have autocrine function to the macrophages, and paracrine function to other cell such as PMN and affect them to produce some biological functions. In the present study, human PMN were tested for the expression of $IL-1{\beta}$ and $MIP-1{\alpha}$ mRNA. Also we performed the receptor binding assay and in vitro assay for the antimicrobial action of HL-60 cell to determine whether HL-60 can replace the peripheral PMN in analyzing the biological functions. PMN were stimulated with $IL-1{\beta}$, TPA, $MIP-1{\alpha}$, LPS, IL-2 and total cytoplasmic RNA were extracted for the northern blot analysis. In order to determine the induction kinetics of $IL-1{\beta}$ or $MIP-1{\alpha}$ mRNA expression, cells were stimulated for 0,1,2,3 hours. We found peak expression of $IL-1{\beta}$ mRNA after 1hr of induction with $IL-1{\beta}$, LPS and after 2hr of induction with TPA. $MIP-l{\alpha}$ also induced but a scarce $IL-l{\beta}$ message from PMN. In contrast to the $IL-l{\beta}$ mRNA expression, $MIP-1{\alpha}$ were not induced from PMN in any culture conditions. Receptors for $MIP-1{\alpha}$ were identified on dibutyryl cyclic AMP(dbcAMP)-treated HL-60 as well as peripheral PMN. dbcAMP treatment significantly enhanced antimicrobial action of undifferentiated HL-60 cell. MIP-1 further increased enhancing effect of dbcAMP. $IL-1{\beta}$, to a lesser extent, also increased dbcAMP-induced enhancing effect of antimicrobial action of HL-60 cell.