니켈을 함유한 콜타르 피치 결합제를 이용한 미생물연료전지 산화전극 성능개선

윤형선(Hyung Sun Yoon),송영채(Young Chae Song),최태선(Tae Seon Choi) 大韓環境工學會 2015 대한환경공학회지 Vol.37 No.9

팽창흑연과 탄소나노튜브를 이용한 산화전극을 CTP에 Ni을 혼합한 결합제로 제작하였으며, 산화전극에 CTP와 Ni을 혼합한 결합제와 Nafion 결합제를 대조구로 미생물연료전지의 성능에 미치는 영향을 회분식 실험을 통하여 조사하였다. 산화전극 제작에 사용된 CTP 양이 적을수록, Ni 함량이 증가할수록 산화전극 표면에 부착성장한 미생물량이 증가하였으며, 내부저항이 감소하였다. CTP 4 g과 Ni 0.2 g을 혼합한 결합제로 제작한 산화전극의 경우 최대전력밀도는 738.11 mW/m2, 내부저항은 146.19 Ω이다. 대조구인 Nafion결합제로 제작한 산화전극와 비교하여 최대전력밀도는 23.68% 컸으며, 내부저항은 33.82% 낮았다. 따라서, CTP와 Ni을 혼합한 물질은 저렴하고 효율이 높은 미생물연료전지의 산화전극결합제로서 좋은 대안이 될 수 있다. The composite anodes of expanded graphite (EG) and multiwall carbon nanotube (MWCNT) for microbial fuel cells were fabricated by using coal tar pitch (CTP) binder containing nickel (Ni), and the effect of the anodes with the binders on the performance of the MFCs were examined in a batch reactor. During the start-up of the MFCs, quick increase in voltage was observed after a short lag phase time, indicating that the CTP binder is biocompatible. The biomass attatched on the anode surface was more at higher Ni content in the binder, as well as at smaller amount of CTP binder for the fabrication of the anode. The internal resistance of the MFC was smaller for the anode with more biomass. Based on the results, the ideal combination of CTP and Ni for the CTP binder for anode was 2 g and 0.2 g, respectively. The maximum power density was 731.8 mW/m2, which was higher 23.7% than the anode with Nafion binder as control. The CTP binder containing Ni for the fabrication of anode is a good alternative in terms of performance and economics of MFCs.

3D 프린팅 기술과 미래식품산업의 응용

윤형선(Hyung-Sun Yoon),이미현(Mihyun Lee),김현연(Xuanyan Jin),김수진,이소윤(Soyeon Lee),김연비,유영선(Young-Sun You),이진규(Jin-Kyu Rhee) 한국식품과학회 2016 식품과학과 산업 Vol.49 No.4

The potentialities of 3D printing technology are discussed from technical and research-oriented perspectives for industrial manufacturing of a variety of food products. Currently, 3D printing technology has advanced to enable us to process or cook innovative foods. However, food-based materials for 3D printing are still limited in terms of eating qualities, nutritional values and functionality as well as industrial production. Therefore, this uprising issue on alternative food processing techniques especially focused on the exploration of new food materials combined with these 3D printing technologies needs to be re-spotlighted, and then solved to pave the way to this innovative and sensational area of investigation with more accessibility. In this review, previous research work and industrial applications conducted by frontier research groups in this field are covered, then to open discussion for future research on the 3D printing of food.

광양만 인근 산단 주변 하천의 퇴적물 오염도 평가

윤형선 ( Hyung-sun Yoon ),서성규 ( Seong-gyu Seo ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.1

In this study, We analyze the general items as volatile solids(VS), COD, H₂S, water content and particle distribution in order to investigate of tributary streams which are distributed around the industrial complex and the sediment pollution by the industrial complex poured into the bottom of Gwangyang Bay, In case of the percentage of water content, the average values are 41.7% and 39.5% in the first and second research while the average values of the VS are 5.6% and 4.9%. It appeared generally highly from first investigation and the seasonal factor has a large effect on the results. In case of the COD, the average values are 8.7mg/dry-g and 6.3mg/dry-g in the first and second research while the average values of H₂S are 0.428mg/dry-g and 0.13mg/dry-g. For the particle distribution, the respective average values of sand, silt and mud in the first and second research are 25.2% and 28.1, 18.3% and 22.4%, 56.5% and 49.5%. It is confirmed that the coefficient of determination constant(R₂) values of VS and COD are higher than any others. From the general items of sediment analysis results, the trend of sediment pollution distribution is in the following order: The stream around Yeosu Industrial complex(R-1, R-2) > the stream around Gwangyang steelworks(R-3) > the river around Chonam Industrial complex(R-4). For comparing the concentrations of VS, COD and H2S at Gwangyang Bay during the 5 years, we can indirectly see that the industrial complex take some effect on the sediment pollution of dense tributary stream around Gwangyang Bay.

석유화학 NCC 공정의 부생수소 가스 정제용 PSA 흡착제 특성

정채훈 ( Chae-Hoon Chung ),윤형선 ( Hyung-sun Yoon ),서성규 ( Seong-gyu Seo ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.4

In this study, four types of adsorbents for PSA process suitable for the purification of low-purity by-product hydrogen gas generated in the petrochemical NCC process were selected and their characteristics were reviewed by performing SEM-EDS, XRD, and BET analysis. SEM-EDS analysis showed that P1 was an organic C component, P2 was Si, Al, Ca, Na component, P3 was Si component, and P4 was Al component. In particular, in the case of P2, a Si/Al ratio of 1.2, a Na/Al ratio of 0.20, and a Ca/Al ratio of 0.32 were detected. For XRD analysis, P1 is amorphous and graphite, P2 is a mixture of zeolite 10X and 13X, P3 is amorphous silica gel, and P4 is a typical Al₂O₃ crystal structure. BET synthesis analysis of adsorbents showed that P1 had the most well-developed micropores and P2, P3, and P4 had larger mesopore volumes.

고혈압(高血壓) 뇌졸중(腦卒中) 환자(患者)에 대한 사혈(瀉血)의 강압효과(降壓效果)

문장혁,안호진,정동화,윤형선,장재원,김경선,문익렬,백종엽,이상무,Mon, Jang-hyuk,Ahn, Ho-jin,Jeong, Dong-hwa,Yoon, Hyung-sun,Jang, Jae-won,Kim, Kyung-sun,Moon, Ik-ryoul,Baek, Jong-yeob,Lee, Sang-moo 대한침구의학회 2003 대한침구의학회지 Vol.20 No.2

Objective : The aim of this research was to investigate the depressive effect of depletion of B15(心兪), B23(腎兪), L5(尺澤), B40(委中) in hypertentive stroke patients. Methods : Depletion on B15(心兪), B23(腎兪), L5(尺澤), B40(委中) in hypertentive stroke patient who were admitted in Dong-Seo Oriental Medical Hospital every other day form 4 weeks, without western antihypertensive drug. Results : After treatment in 2nd week, depletion on B15(心兪), B23(腎兪), L5(尺澤), B40(委中) without western antihypertensive drug increased the systolic and diastolic blood pressure. After treatment in 4th week, depletion on B15(心兪), B23(腎兪), L5(尺澤), B40(委中) without western antihypertensive drug decreased the systolic and diastolic blood pressure. After treatment in 4th week, values of RBC and hemoglobine were not significantly changed. Conclusions : Continous depletion on B15(心兪), B23(腎兪), L5(尺澤), B40(委中) in hypertentive stroke patient without western antihypertensive drug implies decreasement of blood pressure, without change of values of RBC and hemoglobine.

흰넓적다리붉은쥐 유래 한타바이러스 분리 및 분자생물학적 특성 비교

송기준(Ki Joon Song),윤형선(Hyung Sun Yoon),고은영(Eun Young Ko),정기모(Gee Mo Jung),박광숙(Gwang Sook Park),이용주(Yong Joo Lee),송진원(Jin Won Song),백락주(Rak Joo Baek) 대한바이러스학회 2000 Journal of Bacteriology and Virology Vol.30 No.1

Two distinct hantaviruses have been isolated from Apodemus agrarius in 1976 and Rattus norvegicus in 1980 in Korea. Since our serosurveys conducted in 1994, a genetically distinct hantavirus from Apodemus peninsulae has been investigated. To isolate hantavirus from A. peninsulae captured in Korea, the lung homogenate of seropositive A. peninsulae inoculated Vero E6 cells. Viral antigen was detected in a progressively higher percentage of cells with subsequent passage after 80 days postinoculation. The new isolate from seropositive Apodemus peninsulae was designated Suchong virus after Suchong valley located in northeastern region of South Korea. Comparing with hantaan virus 76-118 strain, Suchong virus-1, 2, 3 and 4 showed the similarity of 71.0-91.8% at nucleotide and 90.9-94.8% at amino acid sequences in 231 nucleotides region of M segment, and the similarity of 75.1-81.0% at nucleotide and 97.5-100% at amino acid sequences in 237 nucleotides of S segment.

미세먼지 전구체(SOx) 생성에 미치는 유동층 연소로의 공정변수 영향

최석환 ( Seok-hwan Choi ),윤형선 ( Hyung-sun Yoon ),서성규 ( Seong-gyu Seo ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.2

In this study, SOx conversion rate of sulfur content in mixed anthracite was investigated, and factors affecting SOx generation due to each process parameters were analyzed. For this, first, the items necessary for process improvement were analyzed. Next, the optimum Ca/S molar ratio and the temperature in the furnace were derived. The effect of high-powder limestone on the desulfurization effect was tested. In addition, changes in the desulfurization efficiency according to the inorganic components in the coal were also tested. As a result of improving the optimum Ca/S molar ratio and the furnace temperature, the desulfurization efficiency increased from 83 % to 87 %. In the experiment using high powder limestone, the desulfurization efficiency increased from 87 % to 95.5 %. It is predicted that the SOx emissions by about 72.7 % will be reduced . It was found that the improvement effect converted to ultrafine dust emission was 64.6 %, which decreased 394 tons/year(2 units).

Co-PC 촉매의 열적 특성과 VOCs 제거 효과

서성규 ( Seong-gyu Seo ),윤형선 ( Hyung-sun Yoon ) 한국환경기술학회 2004 한국환경기술학회지 Vol.5 No.2

Thermal characteristics of cobalt-phthalocyanine(Co-PC) catalyst have been studied by TGA, FTIR, XRD analysis. The catalytic oxidation of VOCs(methanol, acetaldehyde) has been investigated in a fixed bed flow reactor at atmospheric pressure. TGA thermogram for Co-PC catalyst showed about 85.0% mass loss at 450℃ and the catalyst with heat-treated at 450℃ showed the highest activity for methanol and acetaldehyde oxidation. The complete oxidation of methanol and acetaldehyde over Co-PC catalyst with heat-treated at 450℃ was observed above 320℃ and 350℃ respectively. The catalytic activity with heat-treatment temperatures improved in the order of 800℃<600℃<450℃. The catalytic activity of Co-PC is better than the commercial Co₃O₄. FTIR and XRD results showed that Co-PC catalyst with heat-treated at 45 0℃ was destroyed and metal oxide were formed such as Co₃O₄. This cobalt metal oxide(Co₃O₄) has high catalytic activity on methanol and acetaldehyde oxidation.

망간산화물 촉매를 이용한 악취제거

서성규(Seong-Gyu Seo),윤형선(Hyung-Sun Yoon),마충곤(Zhong-Kun Ma),류의(Yi Liu) 한국대기환경학회 2010 한국대기환경학회지 Vol.26 No.4

메탄올 연소에 대한 구리 프탈로시아닌 촉매의 전처리효과

서성규(Seong Gyu Seo),윤형선(Hyung Sun Yoon),김상채(Sang Chai Kim) 大韓環境工學會 1999 대한환경공학회지 Vol.21 No.11