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

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 학술발표논문집 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.

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

전기방사법과 이원화 열처리 공정을 통한 은 나노섬유의 합성 및 투명전극으로의 응용

이영인,좌용호,Lee, Young-In,Choa, Yong-Ho 한국재료학회 2012 한국재료학회지 Vol.22 No.10

Metal nanowires can be coated on various substrates to create transparent conducting films that can potentially replace the dominant transparent conductor, indium tin oxide, in displays, solar cells, organic light-emitting diodes, and electrochromic windows. One issue with these metal nanowire based transparent conductive films is that the resistance between the nanowires is still high because of their low aspect ratio. Here, we demonstrate high-performance transparent conductive films with silver nanofiber networks synthesized by a low-cost and scalable electrospinning process followed by two-step sequential thermal treatments. First, the PVP/$AgNO_3$ precursor nanofibers, which have an average diameter of 208 nm and are several thousands of micrometers in length, were synthesized by the electrospinning process. The thermal behavior and the phase and morphology evolution in the thermal treatment processes were systematically investigated to determine the thermal treatment atmosphere and temperature. PVP/$AgNO_3$ nanofibers were transformed stepwise into PVP/Ag and Ag nanofibers by two-step sequential thermal treatments (i.e., $150^{\circ}C$ in $H_2$ for 0.5 h and $300^{\circ}C$ in Ar for 3 h); however, the fibrous shape was perfectly maintained. The silver nanofibers have ultrahigh aspect ratios of up to 10000 and a small average diameter of 142 nm; they also have fused crossing points with ultra-low junction resistances, which result in high transmittance at low sheet resistance.

Coherence in Young Children’s Storytelling

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

식도 열공 허니아 치험예

이영,김인구,서동현,김태운,이호성,Lee, Young,Kim, In-Koo,Suh, Dong-Hyeon,Kim, Tae-Woon,Lee, Ho-Sung 대한흉부심장혈관외과학회 1978 Journal of Chest Surgery (J Chest Surg) Vol.11 No.3

The esophageal hiatal hernia is a rare disease entity in children, Especially, the paraesophageal hiatal hernia is an extremely rare. We had experienced a paraesophageal hiatal hernia in 6 month old male baby. He had postprandial vomiting for 4 months. The chest P-A and right lateral X-ray films were shown a round homogenous density in posterior mediastinum. On laparotomy, we couldn`t see the stomach in operative field. We reduced the stomach through the widened esophageal hiatus and repaired hiatal opening. His operative course was uneventful and discharged on the 9th postoperative day.

사이버 공격의 분류와 최신 방어기법에 대한 연구: DDoS 탐지 및 Deep Learning의 활용

이영한 ( Younghan Lee ),백세현 ( Se-hyun Baek ),서지원 ( Jiwon Seo ),방인영 ( In-young Bang ),백윤흥 ( Yunheung Paek ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2

사이버 공격은 점차 다양해지고, 그 위험성은 날로 심각해지고 있다. 가장 강력한 공격 중 하나는 DDoS (Distributed Denial of Service) 공격이다. 본 논문에서는 다양한 사이버 공격을 분류하고 이에 따른 방법 기법을 서술하겠다. 특히, 최신 DDoS 공격 탐지 방법을 소개하고 딥러닝 (Deep Learning) 을 활용한 최신 방어 기법 연구에 대해 살펴보도록 하겠다.

Updates in skin boosting technologies: Trends and future prospects

이영인 ( Young In Lee ) 대한피부과학회 2024 대한피부과학회 학술발표대회집 Vol.75 No.1