Hexahydro-1,3,5-trinitro-1,3,5-triazine(RDX)의 환원적 분해를 위한나노영가철의 성능평가: 회분식 및 칼럼 실험

이충섭,오다솜,조성희,이진욱,장윤석,Lee, Chung-Seop,Oh, Da-Som,Cho, Sung-Heui,Lee, Jin-Wook,Chang, Yoon-Seok 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.6

Reductive degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) by nanoscale zero-valent iron (nZVI) was investigated to evaluate the feasibility of using it for in-situ groundwater remediation. Batch experiments were conducted to quantify the kinetics and efficiency of RDX removal by nZVI, and to determine the effects of pH, dissolved oxygen (DO), and ionic strength on this process. Experimental results showed that the reduction of RDX by nZVI followed pseudo-first order kinetics with the observed rate constant (k_obs) in the range of 0.0056-0.0192 min⁻¹. Column tests were conducted to quantify the removal of RDX by nZVI under real groundwater conditions and evaluate the potential efficacy of nZVI for this purpose in real conditions. In column experiment, RDX removal capacity of nZVI was determined to be 82,500 mg/kg nZVI. pH, oxidation-reduction potential (ORP), and DO concentration varied significantly during the column experiments; the occurrence of these changes suggests that monitoring these quantities may be useful in evaluation of the reactivity of nZVI, because the most critical mechanisms for RDX removal are based on the chemical reduction reactions. These results revealed that nZVI can significantly degrade RDX and that use of nZVI could be an effective method for in-situ remediation of RDX-contaminated groundwater.

머신러닝(Machine Learning) 기법을 활용한 제주국제공항의 운항 지연과의 상관관계 분석 및 지연 여부 예측모형 개발 - 기상을 중심으로 -

이충섭,여혜민,김동신,백호종,Lee, Choongsub,Paing, Zin Min,Yeo, Hyemin,Kim, Dongsin,Baik, Hojong 한국항공운항학회 2021 한국항공운항학회지 Vol.29 No.4

Due to the recent rapid increase in passenger and cargo air transport demand, the capacity of Jeju International Airport has been approaching its limit. Even though in COVID-19 crisis which has started from Nov 2019, Jeju International Airport still suffers from strong demand in terms of air passenger and cargo transportation. However, it is an undeniable fact that the delay has also increased in Jeju International Airport. In this study, we analyze the correlation between weather and delayed departure operation based on both datum collected from the historical airline operation information and aviation weather statistics of Jeju International Airport. Adopting machine learning techniques, we then analyze weather condition Jeju International Airport and construct a delay prediction model. The model presented in this study is expected to play a useful role to predict aircraft departure delay and contribute to enhance aircraft operation efficiency and punctuality in the Jeju International Airport.

마필임상(5)-말목장과 수의사

이충섭,Lee, Chung-Seop 대한수의사회 2008 대한수의사회지 Vol.44 No.6

학술 3 - 봄철의 말목장에서 수의사의 역할

이충섭,Lee, Chung-Seop 대한수의사회 2012 대한수의사회지 Vol.48 No.2

요즘 말산업육성법의 제정, 공포, 발효 이후에 말산업 중 1차산업에서 말목장의 역할이 급부상하고 있다. 과거의 말 산업이라 함은 한국마사회 중심의 경주마관련 산업이 각광을 받았다. 최근의 말 산업은 한국마사회에서 주축이 되어 국회를 통과한 말산업육성법에서 주목하고 있는 승용마관련 산업이라 할 수 있다. 그러나 아직 승용마의 생산이나 육성을 고려할 수 있을 정도의 전문 승용마 목장은 국내에서는 찾아보기 힘들고, 아직 말목장이라 하여 생산과 육성을 전문으로 하는 말목장은 경주마 생산목장이라 할 수 있을 것이다. 특히 망아지의 생산을 고려할 때 번식계절을 따로 가지고 있는 말을 일컬어 계절번식동물이라 하여 봄철에 말목장은 매우 바쁘게 하루를 보내게 된다. 장일성 계절번식동물로서 하루의 햇빛 시간이 길어지기 시작하는 동지부터 암말들의 번식생리는 서서히 활동하기 시작하여 지방에 따라 또는 사양기술에 따라 늦어도 3월 중순이 되면 자연적으로 배란이 가능한 난포를 발육하게 되어 정상적인 임신이 가능하게 된다. 다시 정리를 하면 계절번식동물은 번식기와 비번식기 사이에 수개월의 과도기가 있어서 공태마의 과도기에 대한 관리가 중요함을 강조할 여지가 발생하게 된다.

진해지역 도시관급수불화사업효과에 관한 조사연구

이충섭,성진효,김동기 ( Choong Sub Lee,Jin Hyo Seong,Dong Kie Kim ) 대한예방치과·구강보건학회 1996 大韓口腔保健學會誌 Vol.20 No.2

Study of Gas Separ ation Membrane Process for Biogas Upgrading

Chung Seop Lee(이충섭),Jin Hyuk Yim(임진혁),Dong Wook Kong(공동욱),Su Jeong Jeong(정수정),Jae Hoon Shim(심재훈),Jae Gyu Lee(이재규),Eun Byeol Baek(백은별),Chang Jin Lee(이창진),Seong Yong Ha(하성용) 한국가스학회 2023 한국가스학회 학술대회논문집 Vol.2023 No.5

근감소증 진단을 위한 척추 분류 모델 개발 및 검증

이충섭 ( Chung-sub Lee ),임동욱 ( Dong-wook Lim ),노시형 ( Si-hyeong Noh ),박철 ( Chul Park ),정창원 ( Chang-won Jeong ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2

컴퓨터 단층촬영(CT)을 활용한 골격근 단면적은 근감소증과 관련된 기능을 평가하는 데 사용된다. 일반적인 근감소증 연구는 요추 3번의 골격근량을 주로 보지만 암 또는 폐절제술과의 상관관계를 예측하기 위한 다양한 연구에서는 흉추 4번, 7번, 8번, 10번, 12번 다양한 수준의 골격근량으로 연구를 진행하고 있음을 알 수 있다. 본 논문에서는 흉부와 복부 CT 영상에서 근감소증 진단을 위해서 흉추와 요추의 영역별 슬라이스를 검출하기 위해서 CNN 구조의 EfficientNetV2를 전이학습하여 인공지능 모듈을 개발하였다. 인공지능 모듈은 전체 흉부 및 복부 CT 영상에서 Cervical, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, L1, L2, L3, L4, L5, Sacral 총 19 클래스를 검출하도록 하였다. Test 데이터셋을 사용하여 Confusion Matrix와 Grad-CAM으로 모델의 정확도를 시각화하여 보였으며 검증으로 인공지능 모듈의 정확성을 측정하였다. 끝으로 우리가 개발한 다기관 공동연구 지원 플랫폼에 적용하여 시각화된 결과를 보였다.

시장환경에 따른 균형성과정보의 사용정도와 기업성과

이충섭(Lee, Choong Seop) 한국회계정보학회 2007 재무와회계정보저널 Vol.7 No.2

본 연구에서는 시장환경의 변화에 대응하여 새로운 경영혁신 수단으로서 조직에 도입되고 있는 균형성과정보의 사용정도에 대하여 시장 환경의 제반 특성이 미치는 영향과 함께 균형성과정보의 사용정도와 기업성과의 관련성을 분석하였다. 기업규모를 통제변수로 하고 시장환경의 특성을 시장경쟁, 시장불확실성, 시장성장성 및 시장점유율 등의 다양한 차원으로 측정한 독립변수를 사용하여 균형성과정보의 사용정도를 종속변수로 한 다중회귀모형 다중회귀모형의 분석결과, 시장점유율, 시장경쟁, 시장불확실성 및 시장성장성 변수는 모두 균형성과정보의 사용정도에 대하여 통계적으로 유의한 양의 관계를 나타내었다. 이에 따라 기업의 시장환경은 균형성과정보의 사용정도에 영향을 미치는 것으로 평가할 수 있다. 균형성과정보의 사용정도는 또한 기업성과에 유의한 영향을 미치는 것으로 분석되어 균형성과정보의 사용정도가 높을수록 기업성과는 높게 나타난다고 볼 수 있다. This study analyses the impact of market factors on BSC usage and it s relationship to the firm performance. BSC is introduced as a means of efficient strategic tools for business responding to rapid environmental changes of today. The size of firm is used as a control variable in a Multi-regression model in which four independent variables of market competition, market uncertainty, market growth, and market share are used and regressed on the dependent variable of BSC usage. According to the Analysis results, all market variables give significant statistical influence on BSC usage. BSC usage also has significant statistical influence on the firm performance. It is interpreted therefore that market environment facts are related to the BSC usage which gives ultimate impact on the firm performance.

아마튜어 복싱선수들의 신체적 자기개념 분석

이충섭(Lee, choong-seob) 한국체육교육학회 2010 한국체육교육학회 학술발표대회 Vol.2010 No.2

This research has an objective to recast the role of boxing by establishing a correct awareness and values and understanding self-description on physic to middle and high school students elite boxers, and to analysis physical description of amateur boxers. In order to achieve this purpose, 64 boxers who anticipated middle and high school boxing championship on Chungbuk superintendent flag at present December 2009 were sampled as a universe. This research questionnaire was used physical self-description Korea version scale which was developed by Kim Byeong Jun in order to fit Korea situation from Marsh"s cultivated physical self-description questionnaire(1994), and used after verifying the validity and reliability through preliminary survey. Statistical package SPSS 12.0 Ver was used for the analysis. Also T-test and dispersion analysis was conducted in order to compare physical self-description of boxers by grade, career, weight of middle and high school students. Following conclusion was obtained through data analysis of this research and procedure. First, as a result to compare physical self-description evaluation scale of boxers of middle and hight school. five elements of appearance, physical activity, self-esteem, endurance and overall body among 10 elements show the significant difference by middle, high school, and high school students show high rating scale compare to middle school students on each element. Second, as a result of comparison for physical self-description evaluation scale of boxers by grade, appearance, four elements of physical activity, endurance, and overall body among 10 elements show the significant difference by grade, and high school students show high rating scale compare to middle school students on four elements. The result show that lowest valuation is middle school students 2 grade and highest valuation is hight school students 2 grade among them. Third, as a result of comparison for physical self-description evaluation scale of boxers by career of within one year, two years, three years and more than three years, three elements of sport competence, physical activity and endurance among 10 elements show the significant difference. More experienced boxers showed high evaluation on sport competence, physical activity and endurance Finally, as a result of comparison for physical self-description evaluation scale of boxers by weight of lightweight, middleweight and heavyweight, seven elements of sport competence, slimness, physical activity, flexibility, endurance, muscular strength and overall body among 10 elements show significant difference, and middleweight champion show high evaluation scale compare to lightweight and heavyweight champion on five elements of sport competence, physical activity, flexibility, endurance and overall body except slimness and muscular strength. But lightweight champion show highest on slimness and lowest on muscular strength.

Cu - Zn 훼라이트의 자기적 성질

이충섭(C. S. Lee),이찬영(C. Y. Lee),김철성(C. S. Kim),지상희(S. H. Ji) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1

The cationic distributions and magnetic properties of Cu_xZn_(1-x)Fe₂O₄(0 ≤ x ≤ 1) have been studied by X-ray diffraction and Mossbauer spectroscopy. The crystal structures are cubic spinels in the range 0 ≤ x ≤ 0.9. The ionic distribution of ZnFe₂Zn_(1-x)Fe_x)_A[Zn_xFe_(2-x)]_BO₄, where x=0.1. The distribution of Fe³+ ions was extracted from the Mossbauer spectra below Curie temperature in the whole range 0 ≤ x ≤ 1. The number of Fe³+ ions in the tetrahedral sites and Curie temperature of Cu-Zn ferrite increase with increasing Cu-concentration.