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임현성,김창만,송영은,임채호,김중래 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Carbon monoxide (CO) has been discharged from steel industry and biomass gasification process, highlighted as a feedstock for biological conversion to platform and value-added chemicals. The conventional strains for CO conversion has problems of low growth rate and high sensitivity to oxygen as well as lower conversion yield. Biological conversion of CO is conducted by specific bacteria harboring the wood-ljungdahl pathway (WL pathway) and CO-dehydrogenase. In this study, we attempted to isolate and characterize the novel CO converting strains from the river sediment using the media having the iron bead (Fe0) as external electron source. As a result, 9 strains were isolated and most of the strains were characterized as Clostridium species. CO conversion rates and efficiencies of all 9 strains were compared, and the isolated strains were deposited to KCTC (Clostridium botulinum HN02 and Fonticella tunisiensis HN43).
임현성,김창만,송영은,백지윤,임채호,김중래 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.1
Carbon monoxide (CO) is one of the main waste gas components of the steel industry and biomass gasification process. CO has also been highlighted as a feedstock for biological conversion to platform and valueadded chemicals. Conventional CO-converting strains have drawbacks of slow growth rate and high sensitivity to oxygen as well as low conversion yield. Most CO conversion microbes harbor the Wood-Ljungdahl pathway (WLP) and CO-dehydrogenase, and the reducing equivalent is significantly limited for acetyl-CoA synthesis. In this study, electrochemically active CO converting strains were isolated and characterized using zero valent iron (ZVI) granules (Fe0) as an external electron donor. The strains isolated from ZVI augmented enrichment could also use a carbon electrode as the electron donor, and simultaneously convert CO to acetate and VFAs in a bioelectrochemical system. From enrichment and isolation with ZVI, both Clostridium sp. HN02 and Fonticella sp. HN43 were isolated and showed higher performance for acetate production from CO in BES, and electrochemical activity by cyclic voltammetry.
임현성,최장군,이현철 대한전기학회 2023 전기학회논문지 P Vol.72 No.1
This paper analyzed internal environmental impact of energy storage device facilities connected to the photovoltaic power generation system. The use of energy storage system is increasing for demanding in new renewable energy (photovoltaic power, wind power, etc.) and adjusting frequency regulation(FR) in system operation. Since fires are concentrated in energy storage systems for connection with renewable energy, it is necessary to find the cause of the fire through analysis of the on-site installation environment and operation. This paper analyzes the internal environmental characteristics of energy storage systems connected to photovoltaic power generation and proposes a safety plan.
Acetate and VFA production from carbon monoxide using zero valent iron
임현성,김창만,송영은,임채호,김중래 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
C1 gas has been highlighted for biorefinery process, and it is a valuable feedstock to produce various platform chemicals. The acetate is an intermediate chemical which can be synthesized via Wood-Ljundahl pathway, and further substrate for chain elongation into a higher VFA when sufficient reducing power provided. Hydrogen gas and reducing sugar have problem for providing reducing power for C1 gas conversion (e.g. high price and catabolite repression). ZVI has been widely used as a reducing agent in environmental process. In this study, we examined that the externally provided reducing power from ZVI oxidation, increase acetate production from CO and further synthesis of volatile fatty acids. The effect ZVI on CO/CO<sub>2</sub> conversion was evaluated with acetate production and byproduct formation. The carbon and electron balance provide an information for mechanism of C1 gas conversion and chain elongation. We have shown that ZVI can provide reducing power to microbial C1 gas conversion.
임현성,위대광,주석희 대한시과학회 2010 대한시과학회지 Vol.12 No.3
Purpose : We studied the relationship of dominant eye and fixing eye in heterophoria and heterotropia. Methods : Fifty-one subjects(Male: 21, Female; 30) were measured between seven to sixty three years, evaluated to alternate cover test after AR/K(Canon RK-Fl, Japan) measw·ed. Ocular dominance was determined using hole in-the-card test before measured in subjective refraction. Prism bar was determined using objective deviating tropia angle after refraction. Results : Intermitant heterotropia patients were the most 26 patients(Sl%) in binocular anomalies, equaled to dominant eyes and fixing eyes were 28 patients(55%), non equaled to dominant eyes and fixing eyes were 23 patients(45%). Alternated dominant eyes were searched in esotropia and exotropia each to one patient, esophoria patints were nothing. Dominant eyes had greater degree of myopia than nondominant eyes but show no significant difference between eyes(p=0.95), fixing eyes had lesser degree of myopia than nondfixing eyes but show no significant difference between eyes(p=0.88). Conclusions : The analysis showed that using a combination of dominant and fixing eye test because small deviating eyes would be likely to different from dominant eye to fixing eye, alternated fixing eyes.
안경원의 안경 조제·가공료와 피팅비 정착화에 관한 연구
임현성,이은희,정미아 한국융합학회 2017 한국융합학회논문지 Vol.8 No.12
In this research, we conducted a questionnaire survey of contents necessary for eyeglass dispensing & fitting fee and characterization solution of eyeglass dispensing & fitting fee. From August 1, 2016 to September 30, questionnaires were set up for 202 spectators of Seoul and Gyeonggi area, questionnaire survey was conducted online and offline. Statistical processing of all data was performed using Origin Pro 8.5. 92.1% (186 people) and 93.1% (188 people) were positively evaluating the necessity of introduction for the necessity of introducing eyeglass dispensing & fitting fee, respectively. The result suggested that it is necessary to establish the position of the optician as a medical service expert by providing a more stable policy through analysis of overseas cases of eyeglass dispensing & fitting fee. 본 연구에서는 안경 조제·가공료와 피팅비 필요성 및 정착화에 필요한 내용에 대한 설문조사를 실시하였다. 2016년 8월 1일부터 9월 30일까지 서울, 경기 지역의 안경사 202명을 대상으로 각 설문항목을 설정하고 온라인 오프라인으로 설문조사를 실시하였다. 모든 자료의 통계처리는 Origin Pro 8.5를 사용하여 실시하였다. 안경 조제·가공료와 피팅비 도입의 필요성에 대하여서는 각각 92.1%(186명), 93.1%(188명)가 도입 필요성에 대해서 긍정적으로 평가하고 있었다. 안경 조제·가공료와 피팅비에 대한 설문분석 및 해외사례를 통해 안정화된 정책을 제공함으로써 보건의료 서비스 전문가로서 안경사의 위치를 정립하여야 할 필요가 있다고 조사되었다.
한국인 넙다리곧은근의 형태학적 특징과 혈관분포에 관한 계측적 연구
임현성,김창수,남용석,신채수,한승호,윤지희,백두진 대한체질인류학회 2002 해부·생물인류학 (Anat Biol Anthropol) Vol.15 No.3
Characteristics and Arterial Distribution of Rectus Femoris Muscle in KoreanHyun Sung Leem, Chang Zhu Jin, Yong Seok Nam, Chae Soo Shin, Seung Ho Han1, Jee Hee Youn, Doo Jin Paik