Measurement of Sound Transmission Loss by Using Impedance Tubes

정성수,김용태,이용봉,조승일,이종규 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2

The sound transmision los of several sound absorbent materials was measured by using an impedance tube and was compared with theoreticaly calculated values. The impedance tube system designed for the testing consisted of an upstream tube, a sample-holder section and a downstream tube. The transfer function method and a four-pole matrix analysis were used in measuring and calculating the sound transmision los, respectively. Good agrement betwen the measured and the theoretical values was obtained.

Evaluation of Airborne Bacteria and Fungi in Surgical Areas at the Animal Hospital

정성수,강윤태,Yawon Hwang,유승원,장혜진,오혜종,강지훈,장동우,나기정,김근형 한국임상수의학회 2017 한국임상수의학회지 Vol.34 No.2

Studies on the concentration of airborne microorganisms in human medicine as a part of a study on the nosocomial infections have been conducted properly, but in veterinary medicine, there has been rarely performed in Korea to the best of study’s knowledge. The purpose of this study was to evaluate the distribution of airborne microorganisms and to identify their species in different places in the animal hospital to alert the necessity of thorough cleanliness management. This study evaluated the concentrations of airborne bacteria and fungi in hospital areas, such as patient waiting room, internal medicine ward, surgical ward and radiological diagnostic ward. The concentration of bacteria and fungi was significantly lower (p < 0.05) in two operating rooms and higher in the patient waiting room. The dominant species of bacteria were Micrococcus spp., Staphylococcus spp., and fungi were Penicillium spp., Dermatophyte mold. Animal hospitals need to perform proper procedures for disinfection, sterilization, and environmental cleaning as well as appropriate employee training and monitoring in order to the maximum prevention of the risk of nosocomial and surgical infections

전국 시ㆍ도교육연수원의 교원연수과정 실태 분석

정성수,서공주,김경원 한국교원교육학회 2017 한국교원교육연구 Vol.34 No.3

본 연구는 전국의 18개 시ㆍ도 교육연수원에서 최근 3년간 교사를 대상으로 이루어진 교원연수과정 현황을 분석하고 이를 토대로 향후 교원연수 개선방향을 탐색해보기 위해 이루어졌다. 분석결과, 원격연수 및 현장맞춤형 연수가 확대되어가는 추세 속에서도 시・도 교육연수원에서 운영한 교원연수과정 수는 매년 양적으로 확대되고 있었다. 연수종별로는 직무연수가 가장 많은 비중을 차지하였으며, 연수대상별로는 초․중등교사 대상의 연수와 관리자 대상 연수가 많았다. 연수 참석비율은 관리자와 수석교사가 높은 반면 일반 교원은 낮았으며, 연수주제별로는 역할수행교육 관련 연수가 많았다. 한편, 연수과정수가 양적으로 확대되는 추세 속에서도 교수학습 관련 연수는 오히려 감소하는 추세를 보이고 있었다. 이와 같은 분석결과를 토대로 향후 교원연수과정의 개선방향을 제안하면 다음과 같다. 첫째, 시・도 교육연수원의 책무성 제고 차원에서 소속 교원들의 연수 참여 비율을 높일 수 있는 방안이 마련되어야 한다. 둘째, 연수과정 및 연수인원이라는 양적 측면에서 시・도 별로 차이가 나타나는 원인에 대한 질적 분석을 토대로 그 차이를 좁히는 노력이 이루어져야 한다. 셋째, 각 시・도 교육연수원에서 이루어지는 연수뿐만 아니라 원격연수, 각종 현장맞춤형 연수 등 모든 교원연수과정을 종합적으로 파악하고, 나아가 타 시도의 교육연수원과 비교․분석할 수 있는 자료를 제공함으로써 각 시․도 교육연수원이 스스로를 점검하고 또 발전할 수 있는 중앙 차원의 지원이 이루어져야 한다. The Purpose of this study is to overview and analyze the current states of teacher training courses of 18 comprehensive education training institutes for the last 3 years from 2014 to 2016 in order to provide the direction of improvement of teacher development. These comprehensive education training institutes, which belong to 18 municipal education offices, are in charge of in-service training teachers. The analysis shows that the number of teacher training courses is steadily growing every year, despite the current trend of expanding distance education training and customized training. In terms of training category, job performance training occupies the biggest percentage, and in terms of training participants, courses for primary and secondary school teachers are most often being operated. When analyzed the percentage of participants versus the total population, managers and chief teachers are participating more often than the ordinary teachers. Role-performing training course ranks the highest in terms of the training topic. One interesting fact is that the proportion of the training for teaching and learning is decreasing despite the total trainig courses are increasing. This study tries to provide some insights on teacher training courses based on the analysis. First, the 18 comprehensive education institutes need to draw up plans for encouraging teachers participation. Second, each comprehensive institutes need to make efforts to narrow the gap between each institutes based on the qualitative analysis on the causes to make the differences. Third, the support from the central government is need to help each comprehensive education institute to compare and analyze their own training practices with other institues and to self-evaluate and seek to improve their practices.

풍력발전과 소음 동향

정성수 대한전기학회 2019 전기의 세계 Vol.68 No.12

再生不良性貧血에 있어서 血小板의 微細構造

鄭聖洙,黃基錫,孫泰重 대한의학협회 1979 대한의학협회지 Vol.22 No.11

개에서 관상동맥내 에피네프린이 기절심근의 관상동맥 혈류량, 산화성대사 및 국소 심근기능에 미치는 영향

정성수,김미경,윤명하,유경연,노명기 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.4

Background: Epinephrine is frequently administered during cardiac surgery. The vascular response to epinephrine might be altered by ischemia and reperfusion, since altered vascular control has been demonstrated even after a short period of ischemia. To test the hypothesis, the effects of epinephrine on regional myocardial contractility, coronary blood flow (CBF) and myocardial oxygen consumption (MVO_2) were investigated before and after ischemia in an open-chest canine myocardium. Methods: Fifteen dogs were acutely instrumented under enflurane anesthesia to measure aortic and left ventricular pressures, pulmonary and left anterior descending (LAD) blood flows via Doppler flowmeter, and subendocardial segment length in the region supplied by LAD. lncremental doses of epinephrine (4, 10, 20, 30 ng/mL of LAD flow) were infused directly into LAD before (normal) and after a 15 min of LAD occlusian and subsequent 30 min-reperfusion (stunned). Segment shortening (%SS), as an index of regional myocardial contractiliy was evaluated. Simultaneous arterial and coronary venous contents of oxygen and lactate were measured during epinephrine (0.0, 4,10,and 30 ng/mL) iincreases in %SS and MVO. These changes were accompanied by excessive increases in CBF, resulting in decreased EO_2. After the ischemia and reperfusion, %SS was depressed and lactate extraction (Elac) was reduced, but similar mechanical responses to epinephrine were observed. However, in the stunned myocardium, CBF increased in parallel with increases in MVO_2, resulting in unaltered EO_2. Results; Epinephrine infusion further decreased Elac, dose-dependently in stunned myocardium. Heart rate and left ventricular systolic and diastolic pressures were little but similarly affected during epinephrine infusions before and after myocardial ischemia. Conclnsions: The results suggest that epinephrine exerts positive inotropic effects in both normal and stunned myocardium, and that epinephrine causes direct coronary vasodilation in normal myocardium, but this effect is abolishein stunned myocardium in dogs. It is also suggested that epinephrine infusion depresses Elac dose-dependently in stunned myocardium.

[발표] 정책담당자의 인사이동이 교육정책집행에 미치는 영향

정성수,오세희,김재금 한국교육행정학회 2010 한국교육행정학회 학술연구발표회논문집 Vol.2010 No.10

Measurement of the Loss Factor and the Young’s Modulus in Structural Steel by Using a Laser Beam Reflection Method

정성수,Yong Bong Lee,전병수,신수현 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.7

A laser beam reflection method was newly proposed to measure the loss factor and the Young’smodulus of materials. The loss factor and the Young’s modulus of a structural steel measured byusing the proposed method were 0.0024 GPa and 197 GPa, respectively. The results agreed withthe measured values obtained by using a conventional laser vibrometer and with other measuredvalues. The agreements ensure the reliability of the laser beam reflection method in measuring theloss factor and the Young’s modulus of materials

반복마취가 SGOT, SGPT, ALP 에 미치는 영향

정성수,하인호,오승균 대한마취과학회 1986 Korean Journal of Anesthesiology Vol.19 No.1

Recently halothane and enflurane are commonly used inhalational anesthetic agents in our country. However, it is a controversial matter whether these agents are a potential threat to the liver. Therefore, in order to evaluate the effects of halothane and enflurane on the hepatic function, we divided a anesthetized patients into the following 4 groups. 1st group; low spinal anesthesia. 2nd group; single inhalational anesthesia with halothane. 3rd group; repeated secondary inhalational anesthesia with halothane. 4th group; secondary inhalational anesthesia with enflurane following halothane. On postoperative 1st, 3rd, 5th, 7th, 10th day, we checked the levels of SGOT, SGPT and ALP. The results are as follows. group 1. Low spinal anesthesia(10 cases) ;SGOT and SGPT levels-no change or recovered in 9 cases (90%) ALP level-no change in all cases. group 2. Single inhalational anesthesia with halothane (14 cases) ;SGOT and SGPT levels-no change or recovered in 13 cases(92%) severely changed in 1 case. ALP level-no change or recovered in 13 cases (92%) group 3. Repeat 2ndary halothane anesthesia following previous halothane anesthesia. (14cases) ; SGOT level-no-change or recovered in 11 cases (79%), severely changed in 2 cases. SGPT level-no-change or recovered in 11 cases (79%), severely changed in 3 cases. ALP level-no-change or recovered in 11 cases (79%), severely changed in 1 case group 4. Repeated 2ndary enflurane anesthesia following previous halothane anesthesia. (11 cases) ; SGOT level-no-change or recovered in 8 cases (72%), severely changed in 2 cases SGPT level-no-change or recovered in 8 cases (63%), severely changed in 2 cases ALP level-no-change or recovered in 5 cases (45%), severely changed in 1 case From the above results, more cases of elevated SGOT, SGPT and ALP levels and slower recovery rate were noted in the repeated anesthesia group than in the one time anesthesia group. Not only the anesthetics themselves but also other variables such as disease severity coincidental illness, transfusion, duration of operation and so on are probably responsible for these alterations.

전신성 홍반성 낭창

정성수,김성윤 한국의학사 1994 診斷과治療 Vol.14 No.10