입자 군집 최적화 방법론을 이용한 효율적 위성임무 일정 수립에 관한 연구

이영인(Young in Lee),이강환(Kang whan Lee),서인우(In woo Seo),고성석(Sung Seok Ko) 한국산업경영시스템학회 2016 한국산업경영시스템학회지 Vol.39 No.1

We consider a satellite mission scheduling problem, which is a promising problem in recent satellite industry. This problem has various considerations such as customer importance, due date, limited capacity of energy and memory, distance of the location of each mission, etc. Also we consider the objective of each satellite such as general purpose satellite, strategic mission and commercial satellite. And this problem can be modelled as a general knapsack problem, which is famous NP-hard problem, if the objective is defined as to maximize the total mission score performed. To solve this kind of problem, heuristic algorithm such as taboo and genetic algorithm are applied and their performance are acceptable in some extent. To propose more efficient algorithm than previous research, we applied a particle swarm optimization algorithm, which is the most promising method in optimization problem recently in this research. Owing to limitation of current study in obtaining real information and several assumptions, we generated 200 satellite missions with required information for each mission. Based on generated information, we compared the results by our approach algorithm with those of CPLEX. This comparison shows that our proposed approach give us almost accurate results as just less than 3% error rate, and computation time is just a little to be applied to real problem. Also this algorithm has enough scalability by innate characteristic of PSO. We also applied it to mission scheduling problem of various class of satellite. The results

플립드러닝을 적용한 대학 물리학 수업과 전통적 수업에서의 학업성취도 비교

간진숙 ( Kan Jin-sook ),이영인 ( Lee Young In ),엄미리 ( Eom Mi Ri ) 충남대학교 교육연구소 2020 교육연구논총 Vol.41 No.4

본 연구의 목적은 대학 물리학 수업에서 플립드러닝 수업방식과 전통적 강의식 수업방식간 학습자의 학업성취도 차이가 있는지 알아보고자 하는 것이다. 이를 위해 서울 시내 K대학교 대학 물리학 교과목을 수강하는 학습자들을 대상으로 1개 분반(실험집단)으로 플립드러닝(Flipped Learning) 수업을 적용하여 운영하였고, 나머지 1개 분반(통제집단)으로 전통적 강의식(Traditional Lecture) 수업을 운영하였다. 학습목표에 따른 문제를 개발하고 이를 변인으로 선정하여 플립드러닝 수업방식 학습자들(실험집단)과 전통적 강의식 수업방식 학습자들 (통제집단)의 두 집단간 동질성을 확보한 후, 학업성취도를 사전·사후 총 4회 점수 및 기말고사 점수로 비교·분석하였다. 그 결과, 총 4회 검사 중 첫 회를 제외한 3회 점수와 기말고사 점수에서 실험집단의 학습자들이 통제집단 학습자들보다 학업성취도가 높게 나타났다. 이는 플립드러닝 방식을 적용한 수업에서 교수자가 학습자들에게 지속적인 학습 지도와 피드백, 학습자들의 참여학습 등을 제공하여 학업성취도가 향상된 것임을 확인한 것이다. 본 연구는 플립드러닝 수업방식이 대학 물리학 수업의 학업성취도 달성에 효과적인 수업방식임을 입증한 사례 연구라는 점에 가치가 있으며, 추후에는 다양한 학문 계열, 교수자의 수업능력, 교수학습 상황에 따라 유용하게 적용할 수 있는 실증적인 연구가 필요할 것이다. This study investigated how teaching method of General Physics flipped learning affects the academic achievement of learners. Specifically, a flipped learning model of General Physics was developed and applied to the class. In addition, after guaranteeing the homogeneity between the two groups, the academic achievement between the flipped learning teaching method learners(experimental group) and the traditional lecture based teaching method learners(control group) was compared and analyzed by pre-test and post-test four times and final exam. As a result, in the scores of the 3rd time and final exam excluding the first time out of a total of four tests, the learners in the experimental group showed higher academic achievement than those in the control group. This confirms that the instructor's continuous learning guidance and feedback affect the academic achievement even in the case of a flipped learning teaching method. This study is valuable in that it is a case study that proves that flipped learning is effective teaching method for getting high academic performance in General Physics, and in the future, empirical research that can be usefully applied according to various academic disciplines, instructor's teaching ability, and teaching and learning situation will be needed.

낙엽 분해에 대한 낙엽 화학성 이론 일반화의 오류

박현진 ( Hyun-jin Park ),양혜인 ( Hye-in Yang ),최우정 ( Woo-jung Choi ),이영한 ( Young-han Lee ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-

Tree foliage litter chemistry such as the concentrations of lignin (L), nitrogen (N), calcium (Ca) and manganese (Mn) plays important roles in the litter decomposition and thus carbon (C) dynamics of forest soils. It has been reported that high quality litters with high N and low L concentrations decompose fast as compared to low quality litters. However, such findings are based on the studies with different tree species such as coniferous and deciduous. Therefore, it is unknown if the effects of litter chemistry on the litter decomposition rate still valid within a species. This study was conducted to investigate the effects of litter chemistry on litter decomposition using litters with contrasting chemical properties for two functionally different species (pine and oak). To collect foliage litter samples with contrasting chemistry, trees were grown under different CO2 concentration, air temperature and soil water and nutrient availability for two years. Four treatments with two litter type and two species were laid out in triplicates. Soils treated with litters were incubated for 45 days and CO2 emission was monitored. At the end of incubation, the microbial community structure was determined by the analysis of easter-linked fatty acid methyl esters (FAMEs). Cumulative CO2 emission was higher for oak than pine litters and this collaborates with the higher litter quality of oak than pine litters such as lower L concentrations and higher Ca and Mn concentrations. However, within the species, the cumulative CO2 emission was higher for litters with lower N and higher L concentrations which is contrasting to the current understandings of the effects of litter chemistry on the decomposition. This result suggests that the current litter chemistry theory on litter decomposition are valid only to compare litter decomposition between different species but not for within the same species. Recent studies suggested that lignin is not stable as it is thought and thus more CO2 can be emitted from soils treated with high lignin litters due to the lower substrate use efficiency, the proportion of assimilated substrates which is utilized for growth relative to substrate being mineralized and respiration, of lignin as compared to other components such as cellulose. In addition, lignin decomposition decreases with increasing Nconcentration of litters as high N availability suppresses the activity of ligninolytic enzyme. The total FAMEs, bacteria and fungi were greater for soil amended with pine than oak, and this also contradicts to the current knowledge that soils of deciduous trees have higher microbial population than soils of conifers due to readily decomposability of deciduous litters. However, as indicated by the lower CO2 emission in the pine than that in oak litters amended soils, C derived from pine litters can be utilized more efficiency by microbes to increase biomass. In this context, the higher microbial populations in the deciduous tree soils than in the coniferous tree soils reported in other studies should be ascribed to the greater amount of annual litters inputs. This study highlights that the current litter chemistry theory is useful in understanding the differences in the litter decomposition between different species; however, a novel theory need to be established to understand the differences in litter decomposition within a species.

영상의학검사 일반촬영 분야의 촬영기법에 대한 분석

김정수(Jung-Su Kim),김정민(Jung-Min Kim),이영한(Young-Han Lee),서덕남(Deok-Nam Seo),최인석(In-Seok Choi),남소라(So-Ra Nam),윤용수(Yong-su Yoon),김현지(Hyun-Ji Kim),민혜림(Hye-Lim Min),허재(Jea Her),한성규(Seong-Gyu Han) 대한방사선과학회(구 대한방사선기술학회) 2014 방사선기술과학 Vol.37 No.3

2013년 국민건강보험심사평가원의 의료기관 데이터베이스에 따르면 1118개의 병.의원에 영상의학과가 개설되어있다. 이들 병원에는 CT, 투시촬영장치, 일반촬영장치와 같은 의료용 방사선 발생장치가 운영되고 있다. 이 중에서도 일반촬영장치는 가장 많은 병원에서 운영되고 있는 장비이다. 일반촬영장치의 경우 film-screen 장치에서 digital radiography 로 급격하게 변하고 있다. 하지만 그 촬영기법은 films-screen 기법 을 그대로 사용하고 있어 디지털 장치의 맞는 촬영기법의 개발을 위한 전반적인 실태 조사가 필요하다. 이에 본 연구에서는 국내 의료기관의 일반촬영기법에 관한 조사를 시행하여 실제 병원에서 사용하고 있는 일반촬 영기법의 기술적 항목에 대한 현황을 파악하여 보았다. 본 연구에서는 의료기관에서 일반적으로 사용되는 일 반촬영기법 26개에 대한 촬영기법의 전국 단위 조사에서 흉부, 두부, 척추, 골반에 해당하는 검사에 대한 분석을 시행하였다. According to database of medical institutions of health insurance review & assessment service in 2013, 1118 hospitals and clinics have department of radiology in Korea. And there are CT, fluoroscopic and general radiographic equipment in those hospitals. Above all, general radiographic equipment is the most commonly used in the radiology department. And most of the general radiographic equipment are chang-ing the digital radiography system from the film-screen types of the radiography system nowadays. However, most of the digital radiography department are used the film-screen types of the radiography system. Therefore, in this study, we confirmed present conditions of technical items for general radiog-raphy used in hospital and research on general radiographic techniques in domestic medical institutions. We analyzed 26 radiography projection method including chest, skull, spine and pelvis which are gen-erally used in the radiography department.

Coherence in Young Children’s Storytelling

Young-In Lee(이영인) 담화·인지언어학회 2014 담화·인지언어학회 학술대회 발표논문집 Vol.2014 No.10

은 나노섬유의 직경제어 합성 및 투명전극 응용 연구

이영인,Lee, Young-In 한국재료학회 2015 한국재료학회지 Vol.25 No.10

One-dimensional (1D) silver nanostructures, which possess the highest conductivity among all room-temperature materials, moderate flexibility and high transmittance, are one of the most promising candidate materials to replace conventional indium tin oxide transparent electrodes. However, the short length and large diameter of 1D silver nanostructures cause a substantial decrease in the optical transparency or an increase in the sheet resistance. In this work, ultra-long silver nanofiber networks were synthesized with a low-cost and scalable electrospinning process, and the diameter of the nanofibers were finetuned to achieve a higher aspect ratio. The decrease in the diameter of the nanofibers resulted in a higher optical transparency at a lower sheet resistance: 87 % at $300{\Omega}/sq$, respectively. It is expected that an electrospun silver nanofiber based transparent electrode can be used as a key component in various optoelectronic applications.

차량의 개별주행행태를 고려한 자동차 배출가스 산정방법론 연구

이영인(Young-in Lee),조혜진(Hye-jin Cho),박준환(Junhwan Park) 서울연구원 2004 서울도시연구 Vol.5 No.4

염 보조 초음파 분무 열분해 공정으로 합성된 TiO₂ 나노입자의 특성에 열분해 온도가 미치는 영향

유재현,지명준,박우영,이영인,Yoo, Jae-Hyun,Ji, Myeong-Jun,Park, Woo-Young,Lee, Young-In 한국분말재료학회 (*구 분말야금학회) 2019 한국분말재료학회지 (KPMI) Vol.26 No.3

In this study, ultrasonic spray pyrolysis combined with salt-assisted decomposition, a process that adds sodium nitrate ($NaNO_3$) into a titanium precursor solution, is used to synthesize nanosized titanium dioxide ($TiO_2$) particles. The added $NaNO_3$ prevents the agglomeration of the primary nanoparticles in the pyrolysis process. The nanoparticles are obtained after a washing process, removing $NaNO_3$ and NaF from the secondary particles, which consist of the salts and $TiO_2$ nanoparticles. The effects of pyrolysis temperature on the size, crystallographic characteristics, and bandgap energy of the synthesized nanoparticles are systematically investigated. The synthesized $TiO_2$ nanoparticles have a size of approximately 2-10 nm a bandgap energy of 3.1-3.25 eV, depending on the synthetic temperature. These differences in properties affect the photocatalytic activities of the synthesized $TiO_2$ nanoparticles.

곤충 머리 부위에 대한 우리말 용어 재조명

이영인,Lee, Young In 한국응용곤충학회 2018 한국응용곤충학회지 Vol.57 No.4

곤충 머리의 부분 명칭들과 동소이명(同所異名)인 suture들의 명칭을 구조의 부분별 위치와 기능을 기준으로 하여 정리하고 우리말 이름들을 체계적으로 모아서 조명하였다. 여기에는 머리 표면의 각종 선, 배자의 머리 구분, 머리의 외골격과 내골격, 입 내부구조, 긴주둥이, 더듬이 외부구조와 기본마디, 더듬이 모양, 표면 털 모양에 관한 용어들이 포함되어 있다. Different English terms indicating a same part in insect head were arranged according to position and function, and their corresponding different Korean terms were suggested. The terms include lines on head surface, head regions of embryo, external and internal skeletons, internal parts of mouth, long mouths, external parts and basic segments of antenna, antennal shapes, and hairs on surface.

폐 인듐주석산화물 타겟의 재활용 기술

이영인,좌용호,Lee, Young-In,Choa, Yong-Ho 한국재료학회 2012 한국재료학회지 Vol.22 No.4

In this study, we demonstrated a simple and eco-friendly method, including mechanical polishing and attrition milling processes, to recycle sputtered indium tin oxide targets to indium tin oxide nanopowders and targets for sputtered transparent conductive films. The utilized indium tin oxide target was first pulverized to a powder of sub- to a few- micrometer size by polishing using a diamond particle coated polishing wheel. The calcination of the crushed indium tin oxide powder was carried out at $1000^{\circ}C$ for 1 h, based on the thermal behavior of the indium tin oxide powder; then, the powders were downsized to nanometer size by attrition milling. The average particle size of the indium tin oxide nanopowder was decreased by increasing attrition milling time and was approximately 30 nm after attrition milling for 15 h. The morphology, chemical composition, and microstructure of the recycled indium tin oxide nanopowder were investigated by FE-SEM, EDX, and TEM. A fully dense indium tin oxide sintered specimen with 97.4% of relative density was fabricated using the recycled indium tin oxide nanopowders under atmospheric pressure at $1500^{\circ}C$ for 4 h. The microstructure, phase, and purity of the indium tin oxide target were examined by FE-SEM, XRD, and ICP-MS.