A Comparative Experimental Study of the, In-vitro Efficiency of Hypertonic, Saline-Enhanced Hepatic Bipolar and, Monopolar Radiofrequency Ablation

Lee, Jeong Min,Han, Joon Koo,Kim, Se Hyung,Sohn, Kyu Li,Lee, Kyoung Ho,Ah, Su Kyung,Choi, Byung Ihn Korean Radiological Society 2003 Korean Journal of Radiology Vol.4 No.3

미더덕의 생리활성이 향상된 아임계수 추출물의 제조

조민지(Min-Ji Jo),한지경(Ji-Kyoung Han),성수창(Su-Chang Sung),이승철(Seung-Cheol Lee) 한국식품영양과학회 2018 한국식품영양과학회지 Vol.47 No.11

미더덕의 이용 다변화를 위하여 아임계수 추출물을 제조하고 생리활성을 평가하였다. 미더덕은 동결건조 분말 상태로 10, 30, 60분 동안 다양한 온도(50, 100, 200, 300℃)에서 추출되었다. 아임계수 조건은 ACE 저해 활성, 항산화 활성, AChE 저해 활성과 같은 중요한 생리학적 특성을 상당히 증가시켰다. 200℃, 60분 추출물에서 가장 높은 ACE 저해활성을 나타냈으나 더 높은 온도 조건인 300℃에서는 급격히 감소하였다. DPPH 라디칼 소거능과 ABTS라디칼 소거능은 300℃, 30분 추출물에서 공통적으로 가장 높은 값을 보였고, AChE 저해 활성 또한 같은 경향을 나타냈다. 이러한 결과는 아임계수 추출이 미더덕의 생리활성을 증가시키는 유용한 가공방법이 될 수 있음을 시사한다. For diverse application of Styela clava (Korean name: miduduck) as a food material, subcritical water (SCW) extract was prepared and its physiological activity was evaluated. To accomplish this, S. clava powder (0.1 g) was placed in a stainless vessel containing 10 mL of distilled water, after which SCW extraction was carried out at 50, 100, 200, and 300℃ for 10, 30, and 60 min. SCW treatment significantly increased important physiological properties of the extract such as angiotensin converting enzyme (ACE) inhibitory activity, antioxidant activity, and acetylcholinesterase (AChE) inhibitory activity. The highest ACE inhibitory activity was found in samples subjected to SCW extraction at 200℃ for 60 min; however, the activity decreased at higher temperature (300℃). The SCW extract of S. clava prepared at 300℃ for 30 min showed the highest antioxidant activity [1,1-diphenyl-2-picrylhydrazyl and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activities] and AChE inhibitory activity. These results indicate that SCW extraction might be a useful method for increasing the physiological activity of S. clava.

습식텍스쳐를 이용한 단결정 실리콘 광학적 · 전기적 특성 연구

한규민(Han Kyu-min),유진수(Yoo Jin-su),유권종(Yoo Kwon-jong),이희덕(Lee Hi-deok),최성진(Choi Sung-jin),권준영(Kwon Jun-young),이준신(Yi Jun-sin) 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4

The presence of ultrasonic wave in caustic cleaning process enhances the remove pollutants, and more homogeneous, textured structure. The silicon wafers, cleaning in Deconex OF 145 solution (0.5~2wt %) with DIW under ultrasonic environment for 5 min. The presence of uniform thin layer of SiO2 on c-Si surface enhances etching rate in the caustic etching mixture solution of NaOH (1.5 wt %), DI water and IPA (6 wt %) at 90℃ for 20 min and results in a fine, more homogeneous and small textured structure.

허혈성 심질환에 있어서 아데노신 급속 정맥투여후 관동맥압의 변화에 관한 연구

봉종대,오종용,배성한,신원용,김철현,이광희,최태명,현민수,김성구,권영주 순천향의학연구소 1998 Journal of Soonchunhyang Medical Science Vol.4 No.2

Background: Adenosine interacts with A1 receptors present on the extracellular surface of cardiac cells, activating K+channels in a fashion. It produces coronary vasodilatation and AV nodal block. The half-time is one to six second and has ultra-short action. In ischemic heart disease, fractional flow reserve(FFR) can be achieved safely with intravenous adenosine infusions at a rate of 150㎍/kg/min which cause maximal coronary hyperemia. Purpose: We investigated the patients who have had ischemic heart disease(n=8). After adenosine intravenous administration(150㎍/kg/min), the effect cause maximal hyperemia of coronary artery. During peak maximal hyperemia, we reported clinical findings, coronary hemodynamics and electrocardiogram findings. Methods: After diagnostic coronary angiography and left ventriculography, catheter was advanced into the ostium of coronary artery. We investigated coronary hemodynamics such as systolic coronary artery pressure, diastolic coronary artery pressure, mean coronary artery pressure and heart rate. To assess the use of adenosine for determination of fractional flow reserve, hemodynamics and electrocardiogram were measured at basal state and during peak maximal hyperemia. Results: Symptoms developed 1.5-2 minute after adenosine intravenous administration and each symptom disappeared 2-2.5 minute after adenosine administration. Two patients represented asymptomatic appearance and six patients complained of flushing, chest pain, palpitation and headache. In eight patients with ischemic heart disease, 1.5 minute after venous administration of 150㎍/kg/min of adenosine, coronary artery pressure decreased and heart rate increased significantly. Conduction abnormalities after administration of 150㎍/kg/min of adenosine were transient 2nd degree AV block 2 cases(25%). Conclusions: Adenosine is a potent ultra short-acting vasodilator. Although coronary artery pressure decreased and heart rate increased and mild cardiovascular symptoms occurred after continuous infusion of 150㎍/kg/min of adenosine, it is useful as an agent for determination of fractional flow reserve.

철골 구조설계 공정 표준화를 위한 CIS/2 AAM 모델 연구

한경민,조수제,박성수 釜山大學校 都市問題硏究所 1999 都市硏究報 Vol.8 No.-

The aim of this research is analysing CIS/2 AAM model fot investigating the Steel Framework Process Data Modeling Standards. This paper introduces CIS/2 AAM model and LPM/5 which is produced by CIMSteel project. and produces it's STEP Part 21 File Translator for exchanging building data, The overall objective of this paper is to analysis LPM/5 Logical Product Model and to evaluate File Read/write Translater. The results of this paper are as follow; 1) The study on CIS/2 is helpful to developing dominant Steel Framework Process Model 2) It may be basis of developing analysis application, which is based on STEP modelling technique.

환경농업 시범마을 논에서 시비에 따른 무척추동물 개체 수 변화

한민수,신중두,나영은,이남종,박문희,김세근 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2

논의 관리방법에 따른 수서생물상의 변동 양상을 파악하기 위하여 종합적인 환경농업기술 시범 2개 지역의 논 및 하천에서 주기적으로 조사 분석하였다. 논에서의 수서 무척추동물의 총 개체 수는 두 지역 모두 농가관행구에 비해 화학비료 토양검정 시비구에서 62% 이상 높았고 그 다음은 두 지역에서 서로 다르게 나타나 옥천의 경우 농가관행구, 양평은 화학비료+개량재 순으로 많고, 가장 적은 처리는 무비구였다. 수서곤충의 총 개체 수는 토양검정시비구가 농가관행구 옥천 및 양평 각각 328, 45.1/L보다 56%, 69% 더 많았다. 갑각류의 총 개체수는 옥천 지역에서는 토양검정 화학비료구> 화학 비료+개량제구> 농가관행구> 무비구 순으로 많았으며, 양평에서는 화학비료+개량제구>토양검정 화학비료>무비> 농가관행구 순으로서 과다 비료시용구인 농가관행구에서 가장 적었다. 두 지역의 논관류 하천에서 서식하는 수서 무척추동물은 59과 76종이 분류되었고, 미확인종이 14종으로 조사되었으며, 특히 물방개과 중 노란테 콩알 물방개 및 땅콩 콩알 물방개가 채집되었고 양평 지역에서는 날도래 종류가 다양하게 서식하고 있는 것으로 나타났다. 하천지류별 수서 무척추동물 서식밀도는 두 지역 모두에서 상류보다는 하류에서 밀도가 높았으며, 옥천의 연평균 성적에서도 하류에서 1300/0.09 ㎡로 최상류에 비해 172% 더 많은 밀도를 나타냈다. 친환경 농업 실천 2개 지역에서의 논 서식 수서 무척추동물 개체 수 조사 결과 일반관행 농가 논 91.1/L 보다 58% 더 많았다. This study was conducted to survey and identify kinds and population of the freshwater invertebrate fauna according to the managements of paddy rice fields at Ok-Chun and Yang-Pyung. The experiment was conducted in 4 paddy plots; conventional fertilization plot (CF), fertilization by prescription with soil testing with (ST+A) or without soil amendment (ST), and no fertilization as the control. In addition, the freshwater invertebrate fauna was also surveyed at 3 sections of as upper, intermediate and down, in both Jitan and Bungsan stream. The total number of the freshwater invertebrates was higher in the order of ST>CF>ST+A>C and ST>ST+A>CF>C at Ok-Chun and Yang-Pyung, respectively. The population density of aquatic insects was higher in plots fertilized by prescription with soid testing than in the other plots at both demonstration villages. The freshwater invertebrates collected in Jitan and Bungsan stream were identified and classified into 59 families and 90 species, and their population density was highest in the downstream among.

전기화재 원인 분석 및 EMTP를 통한 1선 지락사고 분석

남희수,한은희,김민영,김병호,김홍래 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

Everyday, we use electricity from the moment we wake up to the moment we go to bed. Not only it is closely interlinked with our everyday lives, but electric power is also an indispensable source as it is literally the fuel for sustaining industrial and economic development. Against this backdrop, electrical accidents are hazards that not only impose an inconvenience to people, but can also become a disaster that causes substantial loss to a country. Many of factors simultaneously contribute to the occurrence of an electrical fire, but in this paper, we specifically conducted research on line-to-ground faults. As single line-to-ground faults occur the most frequently in the distribution system, we analyzed earth fault currents that occur from the single line-to-ground fault. Moreover, we used the Electro-Magnetic Transient Program(EMTP) to model and simulate OCR (Over Current Relay) during inverse time which can separate fault sections in the distribution system to prevent accidents from spreading into an electrical fire.

레이저 웨이퍼 다이싱 장비의 가공 특성 평가

한민섭,김성수,민병권,이승우,이진하,이혜진 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-

As the semiconductor wafer is required to be thinner for better compactness and higher integrity of the electronic products, mechanical dicing saw technique using the diamond blade is facing serious problems such as low cutting speed, tool wear, side wall crack and back side chipping. Recently, UV laser dicing process has emerged as an alternative methods to the blade dicing especially for the very thin wafers below 100㎛. In this study 355 nm UV laser dicing system has been developed in order to improve the productivity and reliability of ultra thin wafer dicing process. For the quality improvement of the developed dicing system various laser parameters are investigated such as power, speed and frequency of the laser beam. Moreover various measurement techniques are employed to evaluate the dicing quality using optical microscope, SEM and focused ion beam.

건조 재료를 사용한 콘크리트의 포장화에 관한 실험적 연구

한다희,박희곤,백민수,김성식,이영도,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

Most concrete is recently made of an aggregate which is properly absorbed, and earned in it in order to do capability at every fields. We have been close to demand new capability of high flowing and enduring for specific concretes. That is difficult to cope with claiming the efficiency on deterioration from lack of a high quality aggregate. Therefore, For solving the problems we apply to a packing method for using dried materials. That is to say it is a kind of making into an instant. In this study, There is a purpose to present fundamental data, comparing and analyzing a phenomenon about aggregate's absorption following the rate of adding water, for using existing materials.

삼풍 사고 생존자들의 정신과적 증상

이민수,한창수,곽동일,이준상 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.5

1995년 6월 29일 발생한 삼풍 백화점 붕괴사고의 생존자들을 정신과적으로 면담하여 이들의 정신적인 후유증의 여부와 증상의 빈도를 보고자 하였다. 1995년 11월에 안암병원에 내원한 삼풍사고 생존자 중, 정신과적 진찰을 받은 681명의 면담 자료를 대상으로 하여 기술통계 및 빈도분석을 실시하였다. 대상 환자들이 호소하는 증상 중 가장 흔한 증상은 수면장애로 전체환자의 54.2%가 호소하였다. 그 다음으로 두통(31.8%), 예민성(23.3%), 기억나는 상황에서의 심한 고통(24.2%)의 순으로 나타났다. 신체증상 중에는 두통, 흉부 불편감, 사지통, 요통, 소화기계 이상의 순으로 증상을 호소하였다. 위의 결과로 보아 내원 환자의 대부분이 정신과적 증상을 호소하고 있었다. 본 연구에서는 생존자들이 한국의 문화적, 사회적 배경에 따라 서구의 환자들과 다른 양상으로 신체 증상을 호소할 가능성을 고려하였으나, 결과는 서구의 연구결과와 큰 차이를 보이지 않았다. 향후 이 결과를 근거로 하여 외상후에 나타나는 증상들을 한국적 상황에 맞게 분별할 수 있는 자료를 제시할 수 있을 것이다. In order to evaluate psychiatric symptoms in survivors of the Sampoong accident, we interviewed 624 survivors of the accident. The most common complaint of the subjects was sleep disturbance(54.2%). And then, headache(31.8%), irritability and anger(23.3%), intense distress over reminders(24.2%) followed. Common somatic complaints were headache, chest discomfort, extremity pain, backache, and gastrointestinal discomfort. This study revealed that most of the subjects had various psychiatric symptoms after the Sampoong accident.