Rhodococcus sp. EH831에 의한 벤젠, 톨루엔 및 에틸벤젠의 호기성 생분해에 미치는 에탄올의 영향

이승하,이은희,조경숙,Lee, Seung-Ha,Lee, Eun-Hee,Cho, Kyung-Suk 한국미생물·생명공학회 2009 한국미생물·생명공학회지 Vol.24 No.3

The usage of ethanol (EtOH)-blended gasoline (gasohol), has been increasing in recent years. EtOH has influence on the distribution and biodegradation of aromatic compounds such as BTEX (benzene (B), toluene (T), ethylbenzene (B), and xylene (X)) that are gasoline compositions. In this study, the effect of EtOH on the aerobic biodegradation of B, T and E was investigated using a BTEX and EtOH-degrading bacterium, Rhodococcus sp. EH831. The degradation rates of B in the conditions of 1:1, 1:4, and 1:0.25 mixtures with EtOH (B:EtOH, mol:mol) were ranged from $3.82{\pm}0.20$ to $5.00{\pm}0.37{\mu}mol{\cdot}g-dry$ cell wight $(DCW)^{-1}{\cdot}h^{-1}$. The degradation rate of T was the fastest in the 1:0.25 mixture ($6.63{\pm}0.06{\mu}mol{\cdot}g-DCW^{-1}{\cdot}h^{-1}$), and it was the lowest in the 1:4 mixture ($4.41{\pm}0.04{\mu}mol{\cdot}DCW^{-1}{\cdot}h^{-1}$). The degradation rates of E were increased with increasing the addition amount of EtOH: The degradation rate of E was the highest in the 1:4 mixture ($1.60{\pm}0.03{\mu}mol{\cdot}g-DCW^{-1}{\cdot}h^{-1}$), and the rates were $1.42{\pm}0.06$, $1.30{\pm}0.01$, and $1.01{\pm}0.30{\mu}mol{\cdot}g-DCW^{-1}{\cdot}h^{-1}$ in the 1:1, 1:0.25, 1.0 mixtures, respectively. In conclusion, the biodegradation of B, T, E by Rhodococcus sp. EH831 was not significantly inhibited by the co-existence of EtOH.

대중필자 전성시대의 의미

이승하,Lee, Seung-Ha 대한출판문화협회 2005 출판저널 Vol.353 No.-

실리콘 중공 가스켓의 구조적 특성에 관한 연구

이승하,이태원,심우진,Lee, Seung-Ha,Lee, Tae-Won,Sim, Woo-Jin 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10

In this paper, the deformed shape, the contact forces and the load-displacement curves of the real hollow gasket made of silicon rubber are analyzed using a commercial finite element program MARC. In the numerical analysis, the silicon rubber is assumed to have the properties of the geometric and material nonlinearity and the incompressibility, and the hyperelastic constitutive relations of that material are represented by the generalized Mooney-Rivlin and Ogden models. The outer frictional contact between the hollow gasket and the groove of rigid container and the inner self-contact of the hollow gasket are taken into account in the course of numerical computation. Experiments are also performed to obtain the material data for numerical computation and to show the validity of the mechanical deformation of the hollow gasket, resulting in good agreements between them.

1920년대 초기 문예동인지의 시에 나타난 감성 연구

이승하(Lee Seung-Ha) 한국비평문학회 2007 批評文學 Vol.- No.26

An overall review of Korean poetry literature in the 1920s centrally from literary coterie magazines concludes that it largely shows 'romantic emotion' and 'decadent tendency.' The truth is, however, western romanticism had no influence on the poets from this land in the early 1920s. If poets who studied in Japan read Blake or Wordsworth by any chance, we might think about such a possibility, but no evidence for it was found yet. Although some of the works by Byron and Verlain were translated by domestic coterie magazines, they were far from 'decadent tendency.' Looking back at 162 poems from 15 different coterie magazines, such as Changcho vol. 9, Baekcho vol. 3, Pyehuh vol. 2, Post-Pyehuh vol. 1 etc., I find that there were surprisingly more poetry with bright images than with dark images. So the existing criticism on them, in which poetry in the literary coterie magazines of the 1920s are named "pathetic and pale literature of appreciation" or "decadent tendency," might be appropriate for some poetry, but not for all poetry. I reviewed works with bright images here, rather than with dark images which have been discussed a lot so far. As a result, among the literary works of the 1920s, I find that there are a large number of poems dreaming 'hope' and 'yearning,' praising the sun and power, and future-oriented and dynamic ones. The qualities of these works are comparable to those of the poems with dark images mentioned before. In particular, Baek Chul's and Cho Yeonhyun's review on the poetry of the 1920s turned our to be the outcome of prejudice for the most part. In conclusion, despite the fact that about half of the 162 poems in the literary coterie magazines of the 1920s are evidently based upon the emotions of 'hope' and 'yearning,' the study on the poems proved to have been neglected. In this sense, I believe that the 1920s in the history of Korean poetry literature needs to be explored from now on, entirely from a new point of view.

식품 및 환경 기타 Rhodococcus sp. EH831에 의한 벤젠, 톨루엔 및 에틸벤젠의 호기성 생분해에 미치는 에탄올의 영향

이승하 ( Seung Ha Lee ),이은희 ( Eun Hee Lee ),조경숙 ( Kyung Suk Cho ) 한국미생물생명공학회 2009 한국미생물·생명공학회지 Vol.37 No.3

교과내용학 : 한국 청소년 도덕성 검사도구 연구(2차년도) -표준화 및 유형화를 위한 기초연구-

이승하 ( Seung Ha Lee ),김영한 ( Young Han Kim ) 한국윤리교육학회 2013 윤리교육연구 Vol.0 No.31

본 연구는 청소년의 도덕성을 측정하는 표준화된 검사를 개발하는 과제로써 2011년부터 2012년까지 2년간 연구를 실시하였다. James Rest의 4구성요소 이론에 기초하여 도덕적 감수성, 도덕적 동기화, 도덕적 품성화 문항을 개발하였으며, 도덕적 판단력은 기존의 KDIT로 구성하였다. 2012년 2차년도 연구에서는 1차년도에 개발된 문항을 수정, 보완하는 작업을 통해 문항을 확정하였다. 본 논문은 개발된 검사도구를 표준화, 유형화하기 위한 것이다. 전국단위 본 조사를 통해 나타난 한국 청소년의 도덕적 특징은 다음과 같다. 6216명의 청소년의 표준화결과, 도덕적 감수성, 동기화, 품성화의 경우 7점 척도 중 4-6점대에 해당하는 점수가 가장 많이 나타났으며, 판단력의 경우 점수가 올라갈수록 낮은 빈도를 나타냈다. 또한 유형화의 분석대상이 된 5729명의 청소년 중 모든 도덕적 요소가 높거나 낮은 유형은 극히 적었으며, 특정한 한 요소가 지배적인 유형이 대부분이었다. 특히 판단력이 우세한 경우가 가장 빈번했다. 본 연구는 검사도구의 표준화와 유형화를 통해, 그 활용도를 높이고, 교육현장에서 도덕적 특징을 쉽게 파악할 수 있는 인성관련 검사도구를 개발하였다는 점에서 의의가 있다. 마지막으로 향후 도구의 지속적인 보완과 활용방안 및 후속연구방향에 대하여 제안하였다. This study is based on the project to develop an instrument to examine Korean youth morality, conducted from 2011 to 2012. The KYMT is based on James Rest`s four component model: moral sensitivity, moral reasoning, moral motivation, and moral character. The first draft of the instrument developed in 2011 was revised and supplemented in 2012. This study aimed to standardize the KYMT and categorize an individual`s moral type. The KMYT was applied to 6216 middle school students in national level. In results, standardized norms were indicated by each component and 6 categories were made. Fewer students had higher scores in moral judgment whereas majority of responses were located in 4-6 points in 7 likert scale in moral sensitivity, motivation, and character. Most participants had one dominant component and few participants were dominant across 4 components. This study provides useful information of moral characteristics of Korean youth and suggests practical usage for moral education and furthur studies.

극저온까지 온도변화에 따른 질소 충전 소형 금속 벨로우즈의 변형 해석

이승하(Seung Ha Lee),이태원(Tae Won Lee) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.10

인문학적 상상력과 서사전략 한국 현대 소설에 나타난 전화를 통한 일상성 연구 -1970년대부터 2000년대 소설을 중심으로-

이승하 ( Seung Ha Lee ),이충만 ( Choong Man Lee ) 한국현대문예비평학회 2011 한국문예비평연구 Vol.- No.36

Telephone is one of important media in modern daily life. Since telephone was diffused, it has altered constantly according to the indication of the times and the needs of people. Modern Korean novels reflect well on its feature, so they have tried to express daily life of people by telephone. Therefore, to study the progress of telephone is deeply related to both the historical change of daily life and Korean Modern history. According to the times, Korean novels has reflected on the consciousness of the present age. The telephone in 1970s is awesome like the other stuffs from Western civilization. So, it exists as just a tool. But, gradually telephone becomes the symbol of consumption with the economic growth in 1980s. The advent of public phone in 1990s makes telephone to get the emotional function beyond technical one. And, it is made to be the media as the expansion of the human body by the diffusion of public phone. Nowadays, cellar phone develops from the basic function to talk with people in remote places to the higher function to reflect the needs and convenience of people. Telephone changes into the symbol to express its user`s identity. These development of telephone as media have altered the relations among telephone, people, and novels.

내부 기체의 온도 변화에 따른 극저온 냉각기용 소형 금속 벨로우즈의 변형에 관한 연구

이승하(Seung Ha Lee),이태원(Tae Won Lee) 대한기계학회 2015 大韓機械學會論文集A Vol.39 No.4

벨로우즈는 줄-톰슨 소형 극저온 냉각기에서 온도조절장치로 사용하는 중요한 부품이다. 벨로우즈는 매우 얇은 쉘로 제작되었으며 내부는 질소기체로 충전되어 있다. 또한 재료는 니켈-코발트 합금이며 이 재질은 300℃에서 극저온까지 탄성계수와 강도가 변하지 않는 금속이다. 벨로우즈 내부의 기체는 온도가 바뀌면 기체의 압력과 부피가 변하고 결과적으로 벨로우즈가 길이 방향으로 수축 또는 팽창한다. 이 현상을 해석하기 위하여 주어진 온도에서 기체의 상태방정식이 만족될 때까지 수정된 압력하에서 벨로우즈의 변형과 변형된 내부 체적을 반복적으로 계산하였다. 현 연구에서 기체의 온도-부피-압력 상태를 정의하는 식으로 MBWR 상태 방정식이 채택되었다. 제안한 해석 방법론의 타당성을 증명하기 위하여 실험을 수행하였고 비교결과 수치 해는 실험값과 잘 일치하였다. A bellows is an important temperature control component in a Joule-Thomson micro-cryocooler. It is designed using a very thin shell, and the inside of the bellows is filled with nitrogen gas. The bellows is made of a nickel-cobalt alloy that maintains its strength and elastic properties in a wide range of temperatures from cryogenic to 300℃. The pressure of the gas and the volume within the bellows vary according to the temperature of the gas. As a result, the bellows contracts or expands in the axial direction like a spring. To explore this phenomenon, the deformation of the bellows and its internal volume must be calculated iteratively under a modified pressure until the state equation of the gas is satisfied at a given temperature. In this paper, the modified Benedict-Webb-Rubin state equation is adopted to describe the temperature-volume-pressure relations of the gas. Experiments were performed to validate the proposed method. The results of a numerical analysis and the experiments showed good agreement.

음식물류폐기물 혼합퇴비에 블랙카본과 유용미생물 처리 시 상추 수량에 미치는 영향

이승하 ( Seung-ha Lee ),나홍식 ( Hong-sik Na ),조현종 ( Hyun-jong Cho ),정기완 ( Ki-wan Jung ),정인호 ( In-ho Jung ),장경만 ( Kyung-man Jang ),한광현 ( Gwang-hyun Han ),정우진 ( Woo-jin Chung ),심재홍 ( Jae-hong Shim ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

본 연구는 음식물류폐기물 혼합퇴비에 블랙카본 및 유용미생물을 처리 시 상추의 수량에 어떠한 영향을 미치는지를 구명하기 위해 진행하였다. 시비는 농촌진흥청 시설상추 표준시비량(7.0-3.0-3.6)의 총 질소량을 100%로 하여 무기질비료를 기준량의 50% 수준으로 밑거름(N-P₂O₅-K₂O=1.75-1.5-0.9kg/10a, 1회) 및 웃거름(N-P₂O₅-K₂O=1.75-0-0.9 kg/10a, 3회 분시)으로 나누어 처리하였고, 음식물 류폐기물 혼합퇴비(질소전량 1.98%, 수분함량 26.7%)는 표준시비량의 질소기준 100%로 처리하였다. 블랙카본은 음폐 퇴비 처리량 대비 4% 처리하였고 유용 미생물(Paenibacillus harenae 속, 균수 1.2x10⁶cfu/mL(g))은 음폐 퇴비 처리량 대비 1% 처리하였다. 수량조사는 총 4회 실시하였고 주당 엽수, 생체중, 건물중을 측정하였다. 조사결과 엽수는 무기질비료+음폐퇴비+블랙카본+미생물 처리구에서 주당 28.8개로 가장 많았다. 생체중은 무기질비료+음폐퇴비+블랙카본+미생물 처리구에서 주당 215.8g으로 가장 높았고, 무기질비료+음폐 퇴비+미생물, 무기질비료+음폐 퇴비+블랙카본 처리구 각각 주당 203.0g, 190.6g 순으로 높게 나타났다. 무기질비료+음폐퇴비+블랙카본+미생물 처리구에서 대조구 대비 생체중 및 엽수가 각각 21.7%, 7.0% 증수하였으므로 가장 효과적인 것으로 판단된다.