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이진우 ( Jin Woo Lee ),최현철 ( Hyun Cheul Choi ),이형옥 ( Hyeong Ok Lee ),현길수 ( Kil Soo Hyun ),최정우 ( Jeong Woo Choi ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.1
This study was conducted to achieve the optimized system configuration for the improvement of existing wasterwater treatment. Full-scale plant used for this study consisted of anaerobic-anoxic-oxic (A20) process, final settling basin(FSB), disk-filter (DF), granular activated carbon (GAC) bed, and dissolved air flotation (DAF) processes. System configurations were A2O+FSB for mode I, A2O+FSB+DF`+GAC for mode 2, and A2O+FSB+DAF+DF for mode 3. Influent concentration were on average BOD 1.16.6mg/L, COD 50.3mg/L, SS 130.2mg/L, T-N 27.608mg/L, and T-P 3.562mg/L. As a results, the efficient system configuration was generally in the order of mode 3> mode 2> mode I. The configurations of all mode were effective on BOD, COD and SS removal, whereas the configurations of mode 2 and 3 were effective on nutrient removal.
5G 및 Wi-Fi6 활용한 산업용 멀티 센서 시스템 설계 연구
이성훈(Lee Sung Hun),한동철(Han Dong Cheul),신한재(Shin Han Jae),변상봉(Bong Byeon Sang),정용안(Jung Yong An),조수현(Cho Soo Hyun),임길환(Lim Gil-hwan),최현철(Choi Hyoun-Chul),김태형(Kim Tae Hyung),최승호(Choi Seung Ho) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.6
본 논문은 산업현장 내에서 화재 및 유해가스를 측정하여 5G 및 Wi-Fi6 통신망을 통해 모니터링 장치로 전송하는 멀티 센서 시스템을 제안하고 설계하고자 한다. 본 제안에는 멀티 센서 시스템은 생산설비에서 급격하게 사용되는 전원에 의해 전압이 고르지 못하고 전원 노이즈도 발생되는 환경에서도 안정적으로 작동하여 위급상황시 센서의 정보를 무선 네트워크를 통해 관리자 및 사용자에게 제공할 수 있는 시스템으로 제안하였다.
복막투석 중단없이 성공적으로 치료한 복막투석 치료 중인 당뇨병성 만성신부전 환자에서 발생한 고삼투압성 혼수 2 예
강형주(Hyong Ju Kang),박철휘(Cheol Whee Park),이소연(So Yeon Lee),최현철(Hyun Cheul Choi),이정록(Jeong Rok Lee),손장명(Jang Myung Son),신영신(Young Shin Shin),장윤식(Yoon Sik Chang),방병기(Byung Kee Bang) 대한신장학회 2001 Kidney Research and Clinical Practice Vol.20 No.3
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비인두암 환자에서 방사선 치료중 암의 국소진행으로 오인된 경부 연조직 감염 1례
이소연(So yeon Lee),임소희(So Hi Im),최현철(Hyun cheul Choi),김성환(Sung hwan Kim),전정수(Jung soo Jun),백준현(Joon hyun Back),유진영(Jin young Yoo),노혜일(He il Noh),김훈교(Hoon Kyo Kim) 대한두경부종양학회 2002 대한두경부 종양학회지 Vol.18 No.2
A 38-year-old man, who was diagnosed nasopharyngeal carcinoma (stage T4N2Mx) had rapidly growing lower neck mass (at level IV area) with local inflammation sign during concurrent chemoradiotherapy. After we performed Color Doppler sonography and fine needle aspiration biopsy of the neck mass, we differentiated neck soft tissue infection from tumor extension. Size of the mass decreased after antibiotics therapy. It was difficult to differentiate neck infection from tumor progression during treatment in naspharyngeal carcinoma.
김지연 ( Ji Yeon Kim ),이형옥 ( Hyeong Ok Lee ),최현철 ( Hyun Cheul Choi ),현길수 ( Kil Soo Hyun ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.4
The effects of membrane filtration process (MFP) in improving the effluent quality from wastewater treatment plant were investigated. Granular sludge-sequencing batch reactor (GS-SBR) was used as a bioreactor. MFP using a submerged and external type module with a pore size of 0.22㎛ and a total surface area of 0.047㎡ was applied for this research. The influent concentration were on average COD, TN, TP concentration of 600mg/L, 30mg/L, and 6mg/L, respectively. As a result, the GS-SBR coupled with MFP was very effective in reducing particulate matter as well as organic and nutrient removal. Transmembrane pressure (TMP) of MFP increased in proportion to the increase of filtration velocity of MFP, whereas the efficiency of MFP on particulate matter removal slightly decreased with the increase of filtration velocity of MFP due to an improper formation of cake layer on membrane surface. The TMP of external MFP was developed much lower than that of submerged MFP due to an effective pretreatment of GS-SBR process on particulate matter as well as organic and nutrient removal.