축산분뇨 혐기소화 잔재물의 특성 및 초지 적용성 평가

김승민(Seung Min Kim),정웅기(Woong-gi Jung),성용주(Yong Joo Sung),안희권(Hee-Kwon Ahn),김동성(Dong Sung Kim),윤도현(Do-Hyun Yoon),김동섭(Dong-Seop Kim1),정광화(Hwa Gwang Jung) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.3

에너지 저장장치를 포함하는 양방향 DC-DC 컨버터 모델링 및 제어기 설계

김승민,양승대,최주엽,최익,안진웅,이상철,이동하,Kim, Seung-Min,Yang, Seung-Dae,Choi, Ju-Yeop,Choy, Ick,An, Jin-Woong,Lee, Sang-Chul,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3

This paper presents a design and simulation of bi-directional DC/DC boost converter for a fuel cell system. In this paper, we analyze the equivalent model of both a boost converter and a buck converter. Also we propose the controller of bi-directional DC-DC converter, which has buck mode of charging a capacitor and boost mode of discharging a capacitor. In order to design a controller, we draw bode plots of the control-to-output transfer function using specific parameters and incorporate proper compensator in a closed loop. As a result, it has increased PM(Phase Margin) for better dynamic performance. The proposed bi-directional DC-DC converter's 3pole-2zero compensation method has been verified with computer simulation and simulation results obtained demonstrates the validity of the proposed control scheme.

TiO₂ 광촉매 활성에서 Rutile 구조의 영향

김승민,윤태관,홍대일,Kim, Seung-Min,Yun, Tae-Kwan,Hong, Dae-Il 대한화학회 2005 대한화학회지 Vol.49 No.6

Oxytetracycline과 neomycin 복합제의 약욕에 따른 양식 넙치(Paralichthys olivaceus)의 근육내 잔류량 변화

김승민,전려진,정준범,Kim, Seung Min,Jun, Lyu Jin,Jeong, Joon Bum 한국어병학회 2015 한국어병학회지 Vol.28 No.1

본 연구에서는 넙치 (평균체장 및 무게: $20{\pm}2.0cm$, $70{\pm}5.0g$)에 옥시테트라사이클린(oxytetracycline, OTC)-네오마이신(neomycin, N) 복합제를 25-10 ppm 및 50-20 ppm으로 용해하여 2일 동안, 3시간씩 약욕을 실시하였고, 약물투여 중지 후 1일, 5일, 14일, 40일째에 시험군별로 각각 5마리씩 넙치의 근육을 채취하여 항생제 잔류농도를 조사하였다. OTC와 N 표준용액을 농도별로 희석하여 표준곡선을 작성한 결과 각각 $R^2=0.9999$, $R^2=0.9952$로 양호한 직선성을 나타내었고, OTC와 N 회수율은 각각 90~93%, 88~95%가 관찰되었다. 잔류농도에 대한 측정결과, OTC와 N 복합제를 25-10 ppm 투여한 시험군에서 1일째 OTC는 $0.97{\pm}0.084{\mu}g/ml$이 검출되었고, N은 $0.118{\pm}0.079{\mu}g/ml$이 검출되었으나 5일째 이후부터 검출이 되지 않았다. OTC와 N 복합제를 50-20 ppm 투여한 시험군에서 1일째 OTC는 $1.324{\pm}0.062{\mu}g/ml$이 검출되었고 N은 $0.788{\pm}0.05{\mu}g/ml$이 검출되었으나 5일째 이후부터 검출이 되지 않았다. In the present study, we performed a dipping of olive flounder (average length and weight: $20{\pm}2.0cm$, $70{\pm}5.0g$) for a period of three hours a day, over two days, in a melted complex of oxytetracycline (OTC) and neomycin (N), by dissolving 25-10 ppm or 50-20 ppm in water. Subsequently, the remaining antibiotic density in muscle tissue collected from olive flounder was investigated, 1, 5, 14 and 40 days after discontinuation of the medication. 5 fish were used from each group. The standard graph drawn from the results of diluting two standard solutions of OTC and N based on various density levels, showed a relatively straight line with an $R^2$ of 0.9999 and 0.9952, respectively. The recovery rate of OTC was shown to be 90-93% and N, 88-95%. Upon measurement of the remaining antibiotic density in the test group that had been exposed to 25-10 ppm of the complex of OTC and N, $0.97{\pm}0.084{\mu}g/ml$ of OTC and $0.118{\pm}0.079{\mu}g/ml$ N were detected on 1 day of the test. No antibiotic density was detected after day 5 of the test. Regarding the test group that were exposed to 50-20 ppm of the complex of OTC and N, $1.324{\pm}0.062{\mu}g/ml$ of OTC and $0.788{\pm}0.05{\mu}g/ml$ N were detected on day 1 of the test, and no antibiotic density was detected after day 5 of the test.

국내 여윔 넙치에서 검출된 점액포자충 Parvicapsula sp.의 정량적 분석

김승민,정준범,Kim, Seung Min,Jeong, Joon Bum 한국어병학회 2018 한국어병학회지 Vol.31 No.2

여윔증상이 나타난 양식장(farm-B 및 farm-C)의 넙치 및 여윔증상이 나타나지 않은 양식장(farm-A) 넙치의 각 내부 장기(신장, 장, 비장, 뇌 및 간)를 대상으로 점액포자충 Parvicapsula sp.의 양적 분석을 real-time PCR 방법을 사용하여 각각 실시하였다. 여윔증상을 보였던 farm-C의 넙치 신장에서 가장 높은 DNA copy number ($1.7{\times}10^7copies/mg$ tissue)를 보였고, farm-B의 넙치에서는 모든 내부 장기에서 낮은 수치가 나타났으며, farm-A의 넙치에서는 모든 내부 장기에서 음성 결과를 나타내었다. 동일한 시료를 사용한 PCR 및 병리조직학적 분석에서도 real-time PCR에서의 결과와 같은 양상을 보였다. Quantitative analysis of a myxosporean parasite, Parvicapsula sp. in internal organs (kidney, intestine, spleen, brain and liver) from non-emaciated (farm-A) or emaciated (farm-B and farm-C) olive flounder Paralichthys olivaceus were performed by real-time PCR. The highest DNA copy number ($1.7{\times}10^7copies/mg$ tissue) was detected in kidney of the emaciated olive flounder from farm-C, while the DNA copy number was below detection limit in all the organs of the olive flounder from farm-B. There was not positive result in all of organs from olive flounder in farm-A. PCR and histopathological analysis were also performed using the same specimen and showed same results as those by real-time PCR.

건강 자원자에서 위 배출에 미치는 tadalafil의 효과

김민수 ( Min Su Kim ),장진혁 ( Jin Hyuck Chang ),김익성 ( Ek Seong Kim ),황성준 ( Seoung Joon Hwang ),장재훈 ( Jae Hoon Jahng ),김승민 ( Seung Min Kim ),유영훈 ( Young Hoon Ryu ),박효진 ( Hyo Jin Park ) 대한소화기기능성질환·운동학회 2006 Journal of Neurogastroenterology and Motility (JNM Vol.12 No.1

목적: 본 교실에서는 건강 자원자에서 phosphodiesterase (PDE) 5형 억제제인 sildenafil이 전체 위 배출능에는 영향이 없었으나 음식물의 위내 분포에는 영향이 있음을 보고한 적이 있다. 이에 sildenafil 보다 작용시간이 긴 것으로 알려진 tadalafil (cialis(R))은 위 배출에 어떠한 영향을 미치는지 알아보고자 하였다. 대상 및 방법: 건강한 남자 자원자 8명(평균 나이 26.4세)을 대상으로 투약 전, tadalafil 투약 30분 후, 투약 24시간 후에 위 배출 주사를 시행하여 전체 위 배출능을 알아보기 위한 지표로서 total T(1/2) (min)을 구하였고, 위내 분포를 알아보기 위한 지표 중 위 근위부에 대해서는 proximal T(1/2) (min)과 검사식 섭취 직후 위 근위부의 방사선량인 initial proximal activity (%)를, 위 원위부에 대해서는 위 원위부에서 가장 높이 기록된 방사선량인 maximal distal content (%)을 구한 다음 tadalafil 효과 및 24시간 후까지 작용 지속 여부를 확인하였다. 결과: 위 배출 주사 결과 투약 전, tadalafil 투약 30분 후, 투약 24시간 후의 total T(1/2) (min), proximal T(1/2) (min), initial proximal activity (%), maximal distal content (%)가 모두 통계학적으로 유의한 차이를 보이지 않았다. 결론: 최근 시판된 PDE 5형 억제제, tadalafil은 위 배출 및 위내 분포에 유의한 영향을 미치지 않음을 확인할 수 있었다. Background/Aims: In a previous study we demonstrated an influence of sildenafil, a phosphodiesterase (PDE) type 5 inhibitor, on intragastric food maldistribution without affecting total gastric emptying. In this we wanted to determine the effect of tadalafil (cialis(R)), which has longer duration of action than sildenafil, on gastric emptying. Methods: Eight male (mean age, 26.4 yrs) healthy volunteers were selected. Total T(1/2) (min) was measured to assess total gastric emptying before, 30 minutes and 24 hours after tadalafil intake. Proximal T(1/2) (min), initial proximal activity (%)-radioactiviy measured in the proximal body of the stomach immediately after food ingestion-, and the maximal distal content (%)-the highest radioactiviy measured in the distal body of the stomach was measured as indicators of intragastric food distribution. Results: There were no significant differences in total T(1/2) (min), proximal T(1/2) (min), initial proximal activity (%) and maximal distal content (%) before and 30 minutes and 24 hrs after intake of tadalafil. Conclusions: The recently launched PDE5 inhibitor, tadalafil, has no significant influence on total gastric emptying or intragastric food distribution. (Kor J Neurogastroenterol Motil 2006;12:31-34)

PV모듈용 SI-MISO NIBB 컨버터의 인덕터 실효전류 저감 방안

김승민(Seung-Min Kim),조승진(Seung Jin Jo),최민영(Min Yeong Choe),김승수(Seung-Su Kim),김동희(Dong-Hee Kim) 전력전자학회 2023 전력전자학술대회 논문집 Vol.2023 No.7

수동형 댐퍼를 장착한 구조물의 동적응답기반 신뢰성 해석 - 제2편: 시스템 파괴확률 산정

김승민 ( Seung-min Kim ),옥승용 ( Seung-yong Ok ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.5

This study proposes a multi-scale dynamic system reliability analysis of control system as a method of quantitative evaluation of its performance in probabilistic terms. In this second paper, we discuss the control effect of the viscous damper on the seismic performance of the structure-level failure. Since the failure of one structural member does not necessarily cause the collapse of the structural system, we need to consider a set of failure scenarios of the structural system and compute the sum of the failure probabilities of the failure scenarios where the statistical dependence between the failure scenarios should be taken into account. Therefore, this computation requires additional system reliability analysis. As a result, the proposed approach takes a hierarchial framework where the failure probability of a structural member is computed using a lower-scale system reliability with the union set of time-sequential member failures and their statistical dependence, and the failure probability of the structural system is again computed using a higher-scale system reliability with the member failure probabilities obtained by the lower-scale system reliability and their statistical dependence. Numerical results demonstrate that the proposed approach can provide an accurate and stable reliability assessment of the control performance of the viscous damper system on the system failure. Also, the parametric study of damper capacity on the seismic performance has been performed to demonstrate the applicability of the proposed approach through the probabilistic assessment of the seismic performance improvement of the damper system.

저 가속전압 고 분해능 투과전자현미경의 이해 및 응용

김승민(Seung Min Kim),황준연(Jun Yeon Hwang) 한국고분자학회 2014 고분자 과학과 기술 Vol.25 No.3

학습민첩성이 직무배태성을 매개로 조직시민행동에 미치는 영향과 직무자율성의 조절효과

김승민(Kim, Seung Min),홍아정(Hong, Ah Jeong) 숭실대학교 영재교육연구소 2022 Global Creative Leader Vol.12 No.1

본 연구는 학습민첩성과 조직시민행동 간 직무자율성에 조절된 직무배태성의 매개효과를 실증적으로 규명하고 시사점을 제시하는데 목적이 있다. 이를 위해 학습민첩성, 직무자율성, 직무배태성, 조직시민행동 간 영향관계를 분석 후 학습민첩성과 직무배태성의 관계에서 직무배태성의 매개역할을 살펴보고, 이러한 간접경로 효과에 대해 직무자율성의 조절효과를 검증했다. 설문조사에 303명이 참여하였고, SPSS 23.0과 AMOS 23.0을 이용하여 자료 분석하였다. 연구 결과는 다음과 같다. 학습민첩성은 조직시민행동과 직무배태성에 긍정적인 영향을 미쳤고, 직무배태성은 조직시민행동에 긍정적인 영향을 미쳤으며, 학습민첩성과 직무배태성 간 직무자율성의 조절효과가 있는 것으로 나타났다. 학습민첩성과 조직시민행동의 관계에서 직무배태성은 부분매개효과를 나타냈으며 학습민첩성과 조직시민행동 간 직무배태성의 매개효과에서 직무자율성의 조절효과를 갖는 것으로 확인되었다. 이러한 연구 결과를 바탕으로 본 연구의 학문적 의의와 실무적인 시사점을 제시하였다. The purpose of this study is to examine the mediating effect of job embeddedness controlled in job autonomy between learning agility and organizational citizenship behavior. For this purpose: an examination of the correlation between learning agility, job autonomy, job embeddedness, and organizational citizenship behavior, and an analysis of the mediating effect of job embeddedness between learning agility and job embeddedness took place. Also, there was a verification of the moderating effect of job autonomy for this indirect path effect. Software programs: SPSS 23.0 and AMOS 23.0 analyzed the data from a questionnaire survey participated in by 303 employees. The research results are as follows: learning agility positively affected organizational citizenship behavior and job embeddedness. Job embeddedness positively affected organizational citizenship behavior. There was a moderating effect of job autonomy between learning agility and job embeddedness. The relationship between learning agility, organizational citizenship behavior, and job embeddedness showed a partial mediating effect. Job autonomy moderately affected the mediating effects of job embeddedness between learning agility and organizational citizenship behavior. These research results presented, the academic significance and practical implications of this study.