MOSFET multivibrator의 圖式解析

沈壽輔 건국대학교 1976 論文集 Vol.3 No.1

MOSFET Multivibrator에서는 트랜지스터나 진공관 Multivibrator와는 달리 導電時에도 gate 電壓이 一定히 維持되지 않기 때문에 導電時의 gate 電壓을 基準으로 해서 回路를 解析할 수는 없다. 따라서 數式的인 解析이 매우 困難하기 때문에 여기서는 比較的 簡單한 解析方式인 圖式法을 使用하였다. 즉 2個의 FET의 gate電壓 Vg1, Vg2를 座漂軸으로 잡고 이 座標上에 各 FET의 電壓利得曲線을, 그리고 이 圖表에서 FET의 動作點을 求하여 各 drain과 gate 電壓을 算出하는 方法으로 MOSFET 無安定 Multivibrator의 回路를 解析하고 이 方法에 依해서 設計하였다. In a MOSFET astable multivilvator, the gate does not hold into a constant clamp voltage during a conduction. And the analysis of the MOSFET multivibrator circuit is much more difficult than that using a transistor or electron tube. So that this paper, as a simple method, adopts the graphycal analysis as following. The voltage Vc1 and Vc2 across the coupling condensers are taken as a parameters and the voltage gain curves of the two MCOFETs are found by experiments and plotted on the coodinates of the gate voltage Vg1 and Vg2. From this diagram, the wave form of the drains and gates can be derived easily. And therefore the analysis and the design of a MOSFET astable multivibrator are performed using the diagram.

미생물을 이용한 페놀 폐수지처리에 관한 연구

박상헌,심학보,이수구,서성조 서울산업대학교 산업대학원 1992 大學院論文集 Vol.1 No.1

본 연구는 혼합 미생물을 이용한 페놀 함유폐수의 생물학적 처리에 관한 연구로서, 높은 페놀 농도에서의 이를 분해시킬 수 있는 균주를 개발하고 페널 함유폐수의 효과적인 처리를 위한 실험연구이다. 각종 공장폐수, 슬러지, 토양 등 40여종의 시료로부터 페놀 분해균을 선별하였으며, 페놀농도를 단계적으로 높여 미생물을 적응시킨 결과, 페놀농도 1,000ppm의 높은 농도에서도 잘 증식하며 페놀을 효과적으로 분해시킬 수 있었다. 혼합 미생물을 분리 동정한 결과, 우점종은Pseudomonas PI인 것으로 나타났다. 회분식 실험에서 초기 페놀농도, 균체량 및 glucose 농도 등을 변수로 실험하였느데, 페놀 분해속도는 시간에 따라 증가함을 나타내었다. 또한 페놀이 완전 제거되는데 소요되는 시간은 초기 페놀 농도에 비례하였으며, 균체 주입량에 다른 초기 MLSS농도의 대수식으로 나타낼 수 있었다. 연속식 활성 슬러지법에 의한 실험에 있어서, 본 실험조건에서 페놀이 완전 제거되는데 필요한 반응기내의 체류시간은 유입 페놀농도 500ppm인 경우 20시간이 소요되는 것으로 나타났다. This investigation was carried out to study the biodegradation of phenol in wastewater using mixed microorganisms. The mixed clutures of phenol degrading microorganisms were selected from various sources such as industrial wastewaters, sludges and soils. The mixed cultures could be adapted to high concentration of phenol by increasing the phenol concentration step by step. The phenol was degraded easily even up to 1,000ppm of phenol using these microorganisms. The predominant bacteria was isolated and characterized as Pseudomonas PI. In a batch system, the removal rate of phenol increased with time due to the lag time of microorganism adapation. The duration time during which phenol could be completely removed was linearly proportional to the initial phenol concentration. And the duration time(td) could be expressed as a funtion of logarithmic initial MLSS concentration(x) as follows. td=?? [8.68-In(x)] In a continuous system, the required residence time to remove phenol completely was found to be 20 hours and 35 hours 500 ppm and 800 ppm of influent phenol concentrations, respectively.

Herbal medicine (Jogyeongseongjang decoction) for precocious puberty girls: a retrospective study

Soo Bo Shim,Kyu Hee Choi,Seung Yong Lee,Jae Jun Lee,Min Seok Bu,Ju Ah Lee,In Chul Jung,Yang-Chun Park,Seung Chan Park,Hye Lim Lee 한국한의학연구원 2020 Integrative Medicine Research Vol.9 No.2

소아 교통사고 환자의 한방치료 만족도 조사

심수보 ( Soo Bo Shim ),이현희 ( Hyun Hee Lee ),이혜림 ( Hye Lim Lee ) 한방재활의학과학회 2021 한방재활의학과학회지 Vol.31 No.4

Objectives This study aims at using information about treatment satisfaction obtained from surveying pediatric traffic-accident patients to guide future improvement in the quality of traditional Korean medical services. Methods The survey included 95 pediatric patients treated for traffic-accident injuries at a traditional Korean medical institution. The questionnaire was developed from a similar satisfaction survey for adult traffic-accident patients and approved by a traditional Korean pediatrician. The year-long survey ran from April 2020 to April 2021. The collected data were analysed using t-tests, one-way analysis of variance, and cross-tabulation. Results Of the pediatric traffic-accident patients surveyed, the highest percentage of children were aged between 1 and 7 years (70.5%). Just over half the patients (55.8%) complained of sleeping difficulties, and 54.7% exhibited symptoms of anxiety and fear. Almost all the patients surveyed (97.9%) reported an improvement in their symptoms after undergoing traditional Korean medical treatment. The degree of satisfaction with the treatment correlated with the alleviation of symptoms. Approximately 83.2% of respondents reported ‘difficult-to-administer treatment for children’ and rated their satisfaction degree comparatively lower than those patients with no reported treatment difficulties. The most struggling treatment was herbal medicine (42.1%), highlighting the need for improvement in the adaptability of herbal medicine to the treatment of pediatric patients. Conclusions Treatment acceptance by pediatric traffic-accident patients affects reported treatment satisfaction. It is important to improve treatment experience and adaptability to pediatric patients to improve the perceived quality of traditional Korean medical services. (J Korean Med Rehabil 2021;31(4):145-156)

유방암 환자에서 수술적 탈혈류에 따른 Estrogen 및 Progesterone 수용체의 변화

이수정(Soo Jung Lee),이상일(Sang Il Lee),윤성수(Sung Soo Yoon),김홍진(Hong Jin Kim),서보양(Bo Yang Suh),심민철(Min Chul Shim),권굉보(Koing Bo Kwun) 대한외과학회 1990 Annals of Surgical Treatment and Research Vol.39 No.2

딥러닝을 적용한 주간 전력수요예측에 대한 기상인자 선정

권보성(Bo-Sung Kwon),문찬호(Chan-Ho Moon),송경빈(Kyung-Bin Song),심현보(Hyun-Bo Shim),신기준(Ki-Jun Shin),손흥구(Heung-Gu Son) 한국조명·전기설비학회 2022 한국조명·전기설비학회 학술대회논문집 Vol.2022 No.5

Relationship between serum 25-hydroxyvitamin D and interleukin-31 levels, and the severity of atopic dermatitis in children

Cheon, Bo Ram,Shin, Jeong Eun,Kim, Yun Ji,Shim, Jae Won,Kim, Deok Soo,Jung, Hye Lim,Park, Moon Soo,Shim, Jung Yeon The Korean Pediatric Society 2015 Clinical and Experimental Pediatrics (CEP) Vol.58 No.3

Purpose: Atopic dermatitis (AD) is a chronic inflammatory relapsing skin disorder. Vitamin D plays a pivotal role in the development of AD, and interleukin (IL) 31 is known to be related to pruritus in AD. The aim of our study was to determine whether 25-hydroxyvitamin D (25(OH)D) levels are related to IL-31 levels or to the severity of AD. Methods: We enrolled 91 children with AD and 32 control subjects without history or symptoms of allergic diseases. Blood was drawn to evaluate complete blood cell count, total eosinophil count (TEC), and total IgE, specific IgE to common allergens, 25(OH)D, and IL-31 levels. Serum 25(OH)D and IL-31 levels were measured using high-performance liquid chromatography and enzyme-linked immunosorbent assay, respectively. The scoring atopic dermatitis (SCORAD) index was used to evaluate the severity of AD. Results: The mean 25(OH)D level was significantly lower in the AD group than in the control group; 25(OH)D decreased greatly in the moderate and severe AD groups compared with the mild AD group. Children with atopic sensitization showed significantly lower 25(OH)D levels than nonatopic children. However, serum IL-31 levels were not related to AD group, SCORAD index, or 25(OH)D levels. The SCORAD index was inversely correlated with serum 25(OH)D level and positively correlated with TECs and total IgE levels. Children with moderate and severe AD had significantly higher TECs than children with mild AD. Conclusion: Vitamin D is related to the severity of AD independently of IL-31.

대수심, 대심도 초연약지반에서의 DCM공법의 최적 설계

심민보(Min-Bo Shim),김동후(Dong-Hoo Kim),심성현(Seong-Hyeon Shim),강민수(Min-Soo Kang),변기준(Gi-Jun Byun) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.추계

심층혼합처리공법인 DCM(Deep Cement Mixingd)공법은 연약지반에 시멘트 슬러리를 주입하여 교반날개의 회전에 의해 시멘트 슬러리와 지반을 화학적으로 결합시켜 견고한 지반을 형성하는 공법을 말하며, 주로 기초처리공, 흙막이공에 적용되고 있다. 국내에는 1980년대 중반이후에 도입되었으며, 2005년도에는 4축3연의 해상장비 전용선이 개발되어 대심도, 대심도의 초연약지반에서 기초처리공으로 적용성이 확대되고 있다. 본 논문에서는 21m의 대수심, 최대 32m두께의 초연약지반에 방파제 기초처리공법으로 적용된 DCM공법에 대하여 시공 및 품질관리 측면에서의 설계적용기법을 설명하고자 한다. 대수심 적용성을 높이고자 기존 10cm의 시공중첩을 30cm로 확폭하고, 시공조인트를 계획하였으며, 초연약지반 적용성을 높이고자 심도별 시멘트량 적용, 시멘트 토출방식 개선 등을 계획하였다.

Effects of 3D-Printed Polycaprolactone/β-Tricalcium Phosphate Membranes on Guided Bone Regeneration

Shim, Jin-Hyung,Won, Joo-Yun,Park, Jung-Hyung,Bae, Ji-Hyeon,Ahn, Geunseon,Kim, Chang-Hwan,Lim, Dong-Hyuk,Cho, Dong-Woo,Yun, Won-Soo,Bae, Eun-Bin,Jeong, Chang-Mo,Huh, Jung-Bo MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.5

<P>This study was conducted to compare 3D-printed polycaprolactone (PCL) and polycaprolactone/β-tricalcium phosphate (PCL/β-TCP) membranes with a conventional commercial collagen membrane in terms of their abilities to facilitate guided bone regeneration (GBR). Fabricated membranes were tested for dry and wet mechanical properties. Fibroblasts and preosteoblasts were seeded into the membranes and rates and patterns of proliferation were analyzed using a kit-8 assay and by scanning electron microscopy. Osteogenic differentiation was verified by alizarin red S and alkaline phosphatase (ALP) staining. An in vivo experiment was performed using an alveolar bone defect beagle model, in which defects in three dogs were covered with different membranes. CT and histological analyses at eight weeks after surgery revealed that 3D-printed PCL/β-TCP membranes were more effective than 3D-printed PCL, and substantially better than conventional collagen membranes in terms of biocompatibility and bone regeneration and, thus, at facilitating GBR. </P>

Glassy Carbon 전극에서의 벗김 전압-전류법을 이용한 2-Amino-1-cyclopentene-1-dithiocarboxylate의 분석과 전극 반응 메카니즘의 연구

沈允輔,朴德洙,崔星洛,元美淑 부산대학교 기초과학연구소 1988 부산대학교 기초과학연구소 연구논문집 Vol.8 No.-

많은 금속이온들에 대한 킬레이트시약으로 알려진2-amino-1-cyclopentene-1-dithiocarbox-ylate(acdc) 음이온의 전기화학적 거동을 직류 폴라로 그래피, 순환 전압전류법 및 양극 벗김 전압 전류법을 사용하여 수용액 및 아세톤 용액에서 각각 조사하였다. 수용액에서 glassy carbon전극을 사용하였을 때 +0.25V vs. SCE에서 1전자 산화반응을 거쳐 acdc의 이합체가 생성됨을 확인하였으며 이 이 합체는 glassy carbon 전극 표면에 석출되어 흡착이 일어남을 알 수 있었다. 이 흡착된 이합체가 +0.80V에서 2전자 산화반응을 거쳐 S가 한원자 유리된 고리를 형성하는 반응이 일어 남을 알았다. 이러한 이합체 생성반응을 이용하여 이 화합물의 흡착성 양극 벗김 전압전류법에 의한 분석법을 조사하였다. 직류폴라로그래피을 사용한 벗김 전압-전류법에 의해 검량선을 얻은 결과 3 ×10^(-5)M∼10^(-6)M 사이에서 좋은 직선상을 얻을 수 있었으며 확산전류를 사용한 분석법에 비해 약100배 가량 분석감도가 증진됨을 알 수 있었다. 이때 검출한계는 2.5 ∼10^-7)M이었으며 5 ×10^(-6)M에서의 상대 표준편차는 ±4.1%이었다. The electrochemical behavior of 2-Amino-1-cyclopentene-1-dithiocarboxylate(acdc) was investigated by the use of polarography, cyclic voltammetry and cathodic stripping voltammetry at glassy carbon electrode. In this study, it was found that the dimer of the acdc was deposited on the glassy carbon electrode via one-electron oxidation process at ±0.25V vs.SCE. The ring formation between two dithio group occurs along with the elimination of one sulfur atom. The elimination of sulfur atom occurs via two electron oxidation process at ±0.8V vs.SCE. The most sensitive cathodic stripping peak due to the formation of the dimer was observed at -0.85V vs. SCE. The peak relationship between current and concentration was fairly linear in the range of 3 ×10^(-5)∼1.0 ×10^(6)M. The preconcentration procedure enhanced the sensitivity about 100 times for the analysis of acdc using diffusion current. Detection limit was found to be 2.5 ×10^(-7)M and relative standard deviation was ±4.1% at 5.0 ×10^(-6)M DC polarography.