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홍성환,최혁순 한국수처리학회 2018 한국수처리학회지 Vol.26 No.6
This research was done to investigate the bioreduction characteristics of perchlorate in raw sewage because sewage contains biodegradable organics and various microorganisms for biological perchlorate reduction. Two different types of sewage were tested for biological perchlorate reduction in the flasks. Sewage A was collected from the screening equipment and sewage B was collected from the primary settlement in the municipal wastewater treatment facilities. Perchlorate was completely reduced within 72hours from 8.2 and 10.4 mg/L in the sewage A and sewage B flask tests. When perchlorate and nitrate were added in sewage A, both perchlorate and nitrate were reduced. However, perchlorate and nitrate removal rates were 9.3% and 64.0% at 72hours in sewage B. Perchlorate reduction was significantly inhibited by high salinity(0.5% NaCl) in the sewage A and B. These results showed the sewage has potential for the biological perchlorate reduction in the sewage pipe.
Gradationally Complexed Ag/TEMPO-oxidized Cellulose for Multifunctional Textiles
홍성환,유필진 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Electrically conductive fibers play very important roles in realization of wearable technology due to their high flexibility and its various applications. In recent years, researches on the production of conductive fibers by various methods have been actively conducted. Particularly, various researches have been carried out to coat polymers on the fiber and to attach silver particles on polymer. However, when the polymer is coated on the fiber, there is a problem in that the electrical conductivity of the fiber is decreased because the silver particles and the polymer are separated by repeated bending. In order to solve these problems, we researched TEMPO-oxidation method and attaching silver nanoparticles directly to oxidized cellulose to fabricate conductive fiber. The conductive fibers produced by TEMPO-oxidation exhibit constant electrical conductivity and EMI shielding effectiveness.
홍성환,박정우,김희준,김영규,김현재 한국정보디스플레이학회 2016 Journal of information display Vol.17 No.3
In this review, the multi-stacked active-layer (MSAL) structures for the solution-processed amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) are summarized to improve their electrical characteristics and stabilities based on the authors’ previous researches. The MSAL structures can overcome an inherent weakness of the solution-processed AOS TFTs, which is the creation of porosities from solvent volatilization. Furthermore, by modifying each layer, the performance and reliability of the solution-processed AOS TFTs could be improved more. Here, the fundamental studies of MSAL structures with homo-stacked active-layer TFTs are presented, and the various modulations of active layers in hetero-stacked active-layer TFTs are covered. In addition, the effect of the interface between the stacked layers is also discussed.
토끼에 유발시킨 화농성 슬관절염: 자기공명영상과 병리소견의 비교연구
홍성환,고성혜,정혜원,이경원,김종재,강흥식 대한영상의학회 2002 대한영상의학회지 Vol.47 No.6
Purpose: To compare the MR imaging findings of experimentally induced pyogenic arthritis of rabbit knees with the corresponding histopathologic findings. Materials and Methods: Infection was induced in 20 rabbit knees by direct intra-articular injection of Staphylococcus aureus. The animals were divided into four groups of five rabbits each, and spin-echo sagittal T1-and T2-weighted images were obtained 3 days, 1 week, 2 weeks, and 4 weeks, respectively, after staphylococcal inoculation. MR-pathologic correlation was performed, with emphasis on intra-and extra-articular soft tissue lesion characteristics. Soft tissue lesion signal intensity (SI) was classified as low, iso, or high on the basis of that of muscle, and high SI was further subdivided into three categories. Results: At T2-weighted imaging, all soft tissue lesions showed high SI. Pathologic examination revealed the presence of inflammatory cell infiltration (n=2), abscess (n=1), granulation tissue (n=3), fibrosis (n=11), edema (n=4), congestion (n=9), and joint fluid (n=11). Except for the abscess, these lesions were irregular in shape and had variable SI (grade 1-3) and at T2WI could not, therefore, be differentiated. In nine kness, extraarticular soft-tissue lesions were demonstrated at T2WI and correlated with infectious soft tissue lesions such as inflammatory cell infiltration, abscess, granulation tissues and fibrosis; and non-infectious reactive soft tissue changes such as edema and congestion. Conclusion: In pyogenic arthritis, the MR imaging features of soft tissue lesions varied and were nonspecific, depending on the histopathologic abnormalities observed. Our results indicate that in assessing the extent of pyogenic arthritis with MR imaging, caution is required. 목적: 토끼 슬관절에 실험적으로 화농성 관절염을 유발시켜 이에 대한 자기공명영상 소견과 병리소견을 비교분석함으로써 자기공명영상 소견을 병리학적으로 규명하고자 하였다. 대상과 방법: 토끼 20마리의 우측 슬관절에 포도상구균을 직접 주입하는 방법으로 화농성 관절염을 만들었다. 20마리의 토끼를 5마리씩 4개의 군으로 나누어 각각 3일 후, 1주 후, 2주 후, 4주 후에 자기공명영상검사를 시행하였다. 자기공명영상은 스핀에코 T1강조 시상영상과 T2강조 시상영상을 얻었다. 자기공명영상 검사가 끝난 토끼를 희생시켜 조직처리하고 시상면으로 절단하여 병리표본을 제작하였다. 자기공명영상에서 나타난 관절 안쪽 및 바깥쪽 연부조직 병변을 병리소견과 비교하여 분석하였다. 병변의 신호강도는 근육과 같은 신호강도를 등신호강도, 그보다 낮은 경우 저신호강도, 그리고 근육보다 높은 경우를 고신호강도로 분류하었고, 고신호강도를 다시 3개의 등급으로 나누었다. 결과: T2강조영상에서 모든 병변은 고신호강도를 보였고 병리검사에서 염증세포침윤(2관절), 농양(1관절), 육아조직(3관절), 섬유화(11관절), 부종(4관절), 울혈(9관절) 및 관절삼출액(11관절)에 해당하였다. 농양을 제외하고는 모든 병변이 불규칙한 모양을 보였고, 고신호강도의 정도도 1-3등급으로 다양하여 각각의 병변을 자기공명영상 소견으로는 구별할 수 없었다. 자기공명영상에서 관절피막 바깥쪽에 병변을 형성한 경우는 9관절로, 병리검사에서 이들은 염증세포침윤, 농양, 육아조직, 섬유화 등의 감염성 병변과 부종, 울혈 등의 반응성 변화임을 확인하였다. 결론: 자기공명영상에서 화농성 관절염의 연부조직 병변은 그 종류에 따라 다양한 소견을 보여 비특이적인 양상을 나타냈다. 특히, 관절 바깥쪽으로 형성된 병변이 반드시 감염성 병변을 시사하는 것은 아니므로 병변의 범위를 평가할 때 주의를 요한다.